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Saturday, June 28, 2014

1998 Chevy Cavalier Z24 2.4L LD9 PCM Wiring Diagram

1998 Chevy Cavalier Z24 2.4L LD9 PCM Wiring Diagram.


1998 Chevy Cavalier Z24 2.4L LD9 PCM Fuel Pump Relay Wiring Diagram







1998 Chevy Cavalier Z24 2.4L LD9 PCM Fuel Pump Relay Wiring Diagram Schematic.
Notes On Testing Fuel System Circuit To Check Wiring, Find Bad Wiring Or Shorts, Bad Fuel Pump Relay, And PCM Signals On 1998 Chevy Cavalier Z24 2.4L LD9 With 3rd Party After Market Vehicle Key Fob Required Security System Spliced In Up And Behind Drivers Side Lower Dash.

Plastic Key Fob On Key Chain Required To Be Present To Start Car. If The Plastic Key Fob Is Present The Fuel Pump Will Initialize For 2 Seconds Before Cranking. If The Gas Peddle Is Pushed Down To Wide Open Throttle On Power On And Crank That Forces Clear Flood Mode Resulting In A Starter Crank With No Start Condition PCM Will Reinitialize The Fuel Pump For 2 Seconds When Cranking Stops. Attempting To Start Normally After A Forced Clear Flood Mode No Start Will Start The Vehicle Normally.

If The Plastic Key Fob On The Key Chain Is Not Present The Fuel Pump Will Not Initialize On Power On Before Crank Like It Does If The Plastic Key Fob Is Present. When You Attempt To Crank With No Key Fob Present The Starter And The Fuel Pump Do Not Initialize. Cranking Does Not Initialize The Starter And Cranking Does Not Initialize The Fuel Pump. If Clear Flood Mode Is Used The Starter Does Not Initialize, And The Fuel Pump Does Not Re Initialize.

Notes: If Clear Flood Mode Is Used With Key Fob Present And Vehicle Starts Check Injectors For Leaking Injectors, A Bad Injector Seal.

I am confident that I have a bad electrical connection, bad ground or a fuel presure regulator control problem, leaking injectors, or injector seal issues.

When I apply power from battery I can pump until I disconnect.

Have you checked the fuel pump relay?
Did the car stop running because of spark?
Are you cranking to get fuel past the 2 seconds?

While cranking the engine,make a second pin of the relay is getting 12 volts coming from the Powertrain Control Module. This should be the Dark Green/White wire.

If the circuits are good then at the fuel pump relay jumper the 12 volt supply wire to the Gray wire and see if the fuel pump runs.

If the pump still does not come on then check the Gray wire from the relay to the tank and see if the wire is broken.

If there is power on the Gray wire at the tank but the pump does not run then verify the ground to the fuel pump is good and replace the fuel pump.

Can you help me with specifict locations and what kind of power to check on specific wires. I am working against time.

I am very appreciative of your quick response. I will loose some good day light soon.


The fuel pump grounds at G304, which is also the ground for most of the lighting, so if they are all working probably not a ground issue. Maybe the computer is losing supply? Check the green/white wire from the pcm to make sure you the pcm is dropping signal.

Also is did the check engine light come on? Does the security or anti theft light stay on while cranking?

Ok good stuff we might be getting close. The car does have lighting problems. We had to jump from one Sid to the other to get a light to work and day time lights flicker unless lights are turned on.

Where is G304.At the left front of the passenger compartment.

I thought I had a defective pump because I seen power at the pump. But may not have taken the time to see the power disappear after 2 sec. Which does not give it enough time to get fuel up on a newly changed fuel pump.

Definitely try the relearn i gave you, this could be the issue. The problem is that if it is anti theft it will probably need new passlock sensor to fix correctly. At this point I do not think the fuel pump is the issue. If you have power there and the ground is good then the pump should run shortly. If it does not then the pump is bad, that's where we need a fuel pressure guage. Every time you cycle the pump it should run shortly. I feel pretty confident your issue is not in the pump. I will be on again tomorrow some time as I am home with an injury, so let me know.

Ok but here is my issue before I put the tank back in.

Should it not pump fluid.

I just checked with the switch in the run position I get 2sec of power then in the crank I get power till I let off then no power on the gray and solid black which I was told from pump tech Suport is the source for the pump.

When I connect why can't I get fund to pump. If I put 12 on the gray and black I get fluid in less than 2sec.

I just ran another test. Battery a little low. Only getting 7 to 10 volts for two seconds then 5 volts when cranking. So I hooked up the boat battery that I have been using to apply 12 volts to the pump directly as a jumper to the existing in car battery and got the same result.


ps the "theft system" light does not go off after 10 min. As the procedure indicates??

When the ignition switch is turned to the ON position, the PCM energizes the fuel pump relay for 2 seconds allowing the fuel pump to pressurize the fuel system. If the PCM does not receive any ignition reference pulses (engine cranking or running) within 2 seconds , the PCM de-energizes the fuel pump relay; this causes the fuel pump to stop. Yes the gray wire is the power, but if you are losing ignition reference pulses then it shuts off. You are going to have to check the cam and crank signals next. You will need a scanner to check for these signals.


When I apply 12 volts from a boat battery to the Gary and Blk wire I can hear the pump and get instant fuel out of the output.

When I monitor the voltage at the conectors that connects to the pump. In the on position I get between 5 and 8 volts. Then it shuts off like I think it should. As we continue the normal process and turn the key to crank I get the gray and the black to show me the same 5 to 8 volts as long as I am cranking. Which leads me to belieive I may have a bad ground. Could it be that 8 volts is not enogh to power the pump.

A piece of info that I have not shared with you from the past that when you said something about light issues, is that a past just answer mechanic helped me repair a front head light by jumping a wire from the good one to the one that would not work because it was a easier solon that finding a common problem with a junction box under the battery??????

Is it possible that I am looking for a bad ground.
Is their a historical spot I should look at that would be common to light and fuel pump?

The easiest thing to do at this point would be to run a new ground wire at the gray wire at the pump, there has been some problems with these plugs. You have to have 12 v at the pump. If you don't then there is a problem. How many volts are in the battery? This is the voltage that you should be getting at the pump. This system is :

The pcm commands the fuel pump relay on then the relay pulls in and energizes the gray wire to the injectors and the fuel pump. At this point you should get battery voltage at the pump for 2 seconds or while cranking. If you have this scenario then the ground or plug would have to be the culprit. Run a new ground if you have this and it should run.

I have less than 200 ohm resistance from connector at pump to battery.

So I now must look to the B+ side to see where I am loosing power.

Can you please get me the schematic for this circuit and the connector locations?


splice s121 is In the engine harness, front of the engine, approximately 27 cm (11 in) from C100

It is one of two connectors and to be specific the B+. side of the equation. Under the dash board or the one by the tank.

run a external ground from the battery to black at tank that would have and proved the ground to prove not to be the problem.
I then needed and did start checking the B+ points coming from battery to the tank at all of the connection points until I found my voltage drop from 12

About the relay :
While cranking the engine,make a second pin of the relay is getting 12 volts coming from the Powertrain Control Module. This should be the Dark Green/White wire.

If the circuits are good then at the fuel pump relay jumper the 12 volt supply wire to the Gray wire and see if the fuel pump runs.

If the pump still does not come on then check the Gray wire from the relay to the tank and see if the wire is broken.

If there is power on the Gray wire at the tank but the pump does not run then verify the ground to the fuel pump is good and replace the fuel pump.

This test would have shown us if you were losing power, but in your response you said you checked the relay, which I assumed you did my test, so then we moved on to other possibilities, like grounds and connections.

Tuesday, June 24, 2014

LD9 2.4L Engine Hesitation

Engine Hesitation is when your 1998 Chevy Cavalier Z24 2.4L engine runs rough, misfires, stumbles seems to lacks power when you accelerate t the car or step on the throttle. Most engine hesitation problems with the 1998 Chevy Cavalier Z24 2.4L LD9 engine often means that the air/fuel ratio mixture is not being properly enriched or, is going lean, or the ignition system is weak and is misfiring when the engine comes under load or the air/fuel mixture goes lean.

When you step down on the accelerator and the throttle opens, the engine sucks in more air. The computer should respond by adding more fuel.

If the engine has a speed-density type of fuel injection system (no airflow sensor), the computer uses inputs from the throttle position sensor, manifold absolute pressure sensor, air temperature sensor and engine rpm to estimate airflow and how much fuel the engine needs. NOTE: Speed-density systems are much less sensitive to vacuum leaks than EFI systems that use an airflow sensor.

If the engine has an airflow sensor (vane airflow or mass airflow), it looks primarily at the airflow signal from the airflow sensor, but also takes into account what the throttle position sensor and MAP sensor (if equipped) are telling it. NOTE: Airflow EFI systems are very sensitive to vacuum leaks, and air leaks downstream of the airflow sensor.

Consequently, if the inputs from any of these sensors is inaccurate or missing, the engine computer may not add enough fuel, allowing the fuel mixture to go lean causing a misfire that produces a hesitation or stumble when accelerating or opening the throttle.

The amount of fuel added by the computer when the throttle opens may also be insufficient if the fuel injectors are dirty or fuel pressure is low. The oxygen sensors in the exhaust monitor the air/fuel mixture so the computer can adjust fuel trim as needed to maintain the proper air/fuel ratio. Fuel trim adjustments can compensate for dirty injectors and/or low fuel pressure to a certain extent, but occur too slowly to offset a throttle hesitation problem.

Vacuum leaks will typically cause the fuel trim to run rich as the computer tries to compensate for the extra air being sucked into the engine through the leak.
Possible Causes of Engine Hesitation or Stumble:

  1. Dirty fuel injectors (cleaning the injectors often fixes this).
  2. Bad MAP (manifold absolute pressure) sensor
  3. Bad TPS (throttle position) sensor
  4. Bad or dirty MAF (mass airflow) sensor
  5. Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
  6. Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
  7. Bad gasoline (fuel contaminated with water or too much alcohol)


Sometimes, what feels like a hesitation is actually ignition misfire rather than a lean misfire. The causes of engine ignition misfire may include:

  1. Dirty or worn spark plugs.
  2. Bad plug wires.
  3. Weak ignition coil.
  4. Wet plug wires.


using scan tool to diagnose hesitation
Ascan tool that can display sensor data and fuel trim values can help you diagnose a hesitation problem.

DIAGNOSE ENGINE HESITATION PROBLEM

Diagnose may require checking the engine computer with a scan tool for any fault codes (including misfire codes), checking sensor response with a scan tool by looking at the various sensor PIDS (sensor values displayed on the scan tool), and testing sensors with a DVOM or scope if the values are out of range or the sensor is not responding normally. Additional diagnostic checks may include searching for vacuum leaks, inspecting/cleaning the EGR valve, measuring fuel pressure and volume, removing and inspecting the spark plugs, etc.

You can use a scan tool to check the fuel trim readings to see if the engine is running lean. Lean mixtures that are caused by vacuum leaks will have the most noticeable effect at idle. At part and full throttle, there is so much air entering the engine that a little extra air from a vacuum leak has a negligible effect.

Plug your scan tool into the diagnostic connector and start the engine, then look at the Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT) values. Normal range is typically plus or minus 8. If the numbers are +10 or higher for STFT and LTFT, the engine is running LEAN. If you rev the engine to 1500 to 2000 rpm and hold it for a minute or so, and the STFT value drops back down to a more normal reading, it confirms the engine has a vacuum leak at idle. If the STFT value does not change much, the lean fuel condition is more likely a fuel delivery problem (weak fuel pump, restricted fuel filter, dirty fuel injectors or a leaky fuel pressure regulator) than a vacuum leak.

For more information about using fuel trim to diagnose a lean fuel condition, read this article on Fuel Trim by Wells Manufacturing (PDF file, requires Adobe Acrobat to read).


DIAGNOSTIC TIPS FOR P0171 OR P0174 LEAN TROUBLE CODES

A code P0171 or P0174 (or both) indicate the engine is running lean. This means there is too much air and/or not enough fuel.

If you have a scan tool that can display Short Term Fuel Trim (STFT), you can confirm the engine is running lean by looking at the STFT at idle. If STFT is greater than about 10 to 12, the engine is running LEAN. Increase engine speed to 1600 to 2000 rpm and hold for a minute or so, then recheck the STFT value. If it has dropped 3 or 4 points or more, the lean problem is due to a vacuum leak (vacuum leaks have more of an impact on the idle fuel mixture than the cruise mixture). If the STFT valve is still the same, the problem is probably sensor-related (dirty or bad MAF sensor, or bad MAP sensor), or is due to low fuel pressure. The next steps would be to use the scan tool to look at the airflow and MAP sensor readings, and to check fuel pressure.

A lean fuel condition can be caused by:

  1. Low fuel pressure due to a weak pump (use a fuel pressure gauge to check fuel pressure at idle)
  2. Low fuel pressure due leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)

Dirty fuel injectors. (try cleaning the injectors)
Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Check for vacuum leaks)
Leaky EGR valve. (Check the operation of the EGR valve)
Leaky PCV Valve or hose. (Check valve and hose connections)
Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
Repairs will depend on what is causing the hesitation. If the cause is fuel related, it may require cleaning the fuel injectors or fixing a vacuum leak. If the cause is ignition related, it may require replacing the spark plugs and plug wires.

Thursday, June 19, 2014

DTC P0172 Fuel Trim System Rich Bank 1

1998 Chevy Cavalier Z24 2.4L LD9 DTC P0172 Fuel Trim System Rich Bank 1
DTC P0172 Fuel Trim System Rich Bank 1. Checked The air filter. The engine might not be getting enough air. If the engine is not getting enough air the system is rich.

If the air filter is good, or you replaced the air filter and you still pop P0172 then try cleaning the MAF - Mass Air Flow Sensor. Dirt On The MAF Mass Air Flow Sensor can cause MAF Mass Air Flow Sensors To overestimate air flow.

next do a fuel pressure and fuel leak down test
excessive fuel pressure or a leaky injector could cause it

Look at the values again! Read the long term and compare with the short term.
The LONG term is trying to TAKE away fuel, and a LOT of it, not add it
There is a condition somewhere causing the computer to "see" too much fuel and tries to reduce it.

Possible causes
EVAP system failure (Should set a code)
Fuel pressure high
Coolant temp sensor (Should set a code)
EGR system failure
MAF slightly out of range (Should set a code if it is severe enough)

remember (this is difficult for most guys to grasp ) the sensor does not see how much fuel you have in the exhaust, It can only read oxygen levels. So, rich means exhaust gasses are nearly void of any oxygen.
The long fuel trim reading of -16.x indicates that your computer has seen the rich condition and is correcting for it by cutting back on injector pulse width.
Now change that filthy air filter.

Because if it were being caused by an excessive fuel or overfueling condition you'd have black smoke and it wouldn't make it chug when cut back occurs, and your exhaust would be glowing red hot.

Diagnostic Trouble Code (DTC) P0172
Fuel Trim System Too Rich

Features of the Circuit

There will be a deflection in the adaptive terms which is capable of identifying a slow default emerging in case the adaptive value threshold is permanently exceeded.
 As the lambda controller supersedes the adaptation threshold, the two time counters (one for the rich side and another one for the lean side) will be kicked started.
The error or the discrepancy will be detected the moment either of the time counters attains the highest value.
This test is undertaken keeping in mind that a failure that can exceed the adaptive terms can be generated.
The following two failures need to be created.

a) A lean side deviation: P0171
b) A rich side deviation : P0172
Determining the limit good and the limit bad for each kind of failure therefore becomes mandatory.
For any given failure, it is advised to measure the emission threshold until the legal emission thresholds are exceeded.
It must also be noted that the problem is because of the emission thresholds required, which is pretty complicated and the system needs to be affected by some disturbance so that the emission thresholds may be exceeded.
A judicious calibration has already made the tuning but, since the regulation does not approve of such a move it is mandatory to forcibly generate some visible material malfunction like (fuel pressure regulator, fuel injector, air leakage...)etc.

When will DTC set?
Task Boosted When DTC sets
When Does DTC clear?
1) When the system is in closed loop.
1) The Malfunction Indicator Lamp (MIL) will be seen glowing after three failed repetitive trips.

1)   The MIL will stop work after four repetitive ignition cycles where the diagnostic functions flawlessly.

2) When Manifold Absolute Pressure (MAP) ranges between 70 kPa (10.2 psi).

2) The ECM is devised to record operating conditions at the time the diagnostic fails which will be stored in the Freeze Frame and Failure Records will be boosted.

2)  A history DTC will clear after 40 consecutive warm-up cycles without a fault
3) When Coolant temperature > than 80°C(176°F).

3) A history DTC is stored.

3)  The Scan Tool can be made use of in order to clear all DTCs
4)  When  DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0131, P0132, P0337, P0338, P0341, P0342, P0400, P1319, P1402, P1404, P1405, P1671 and P1672 are not set.

-
4) Disconnecting the ECM battery feed for more than 10 seconds



Note: After repairs, use the scan tool Fuel Trim Reset function to reset the long-term fuel trim to 128 (0%).
Fuel pressure – An excessively low pressure will make the system lean. Monitoring fuel pressure while driving the vehicle at various road speeds and/or loads may become necessary here.
Map sensor - An output that enables the ECM to sense a manifold pressure which is  less than normal (high vacuum) can drive the system  lean.In such a case disconnecting the MAP sensor will permit  the ECM to substitute a fixed (default) value for the MAP sensor. If disconnecting the sensor kills the lean condition then substitute a known good sensor and recheck.
Fuel contamination - In trace amounts, water , near the in-tank fuel pump inlet can be added to the injector. water results in  a lean exhaust condition and can set DTC P0171.
Check for poor O2S or MAP sensor connection at the ECM. Inspect the harness connectors for the following conditions:
Improper mating
Damaged terminals
Broken locks
Improperly formed or
Backed-out terminals
Poor terminal-to-wire connection

Also examine the wiring harness to check whether there is any damage.
If the harness seems flawless, then note the O2S display on the scan tool as you move the connectors and the wiring harness related to the engine harness.
Any difference in the display will denote the location of the fault.
                             

You must check the 5 volt reference circuits to inspect whether a short to voltage is in vogue in case you see any DTC P1404 is set.
You also need to see if there is any restricted exhaust system.
Probe the 5 volt reference sensors for abnormal readings in case a shorted 5 volt reference circuit creates a DTC P0172 to set.

OBDII Codes 1998 Chevy Cavalier Z24 2.4L LD9

DTC P0030 HO2S Heater Control Circuit Bank 1 Sensor 1
DTC P0031 HO2S Heater Circuit Low Voltage Bank 1 Sensor 1
DTC P0032 HO2S Heater Circuit High Voltage Bank 1 Sensor 1
DTC P0036 HO2S Heater Control Circuit Bank 1 Sensor 2
DTC P0037 HO2S Heater Circuit Low Voltage Bank 1 Sensor 2
DTC P0038 HO2S Heater Circuit High Voltage Bank 1 Sensor 2
DTC P0050 HO2S Heater Circuit Bank 2 Sensor 1
DTC P0051 HO2S Heater Circuit Low Voltage Bank 2 Sensor 1
DTC P0052 HO2S Heater Circuit High Voltage Bank 2 Sensor 1
DTC P0056 HO2S Heater Circuit Bank 2 Sensor 2
DTC P0057 HO2S Heater Circuit Low Voltage Bank 2 Sensor 2
DTC P0058 HO2S Heater Circuit High Voltage Bank 2 Sensor 2
DTC P0100 MAF Sensor Ckt. Insufficient Activity
DTC P0101 Mass Air Flow (MAF) Sensor Performance
DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency
DTC P0103 Mass Air Flow (MAF) Sensor Circuit High Frequency
DTC P0104 Mass Air Flow Circuit Intermittent
DTC P0105 MAP Sensor Circuit Insufficient Activity
DTC P0106 Manifold Absolute Pressure (MAP) System Performance
DTC P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage
DTC P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
DTC P0109 Manifold Absolute Pressure Circuit Intermittent
DTC P0110 Intake Air Temperature (IAT) Sensor Circuit
DTC P0111 Intake Air Temperature (IAT) Sensor Performance
DTC P0112 Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage
DTC P0114 Intake Air Temperature Circuit Intermittent
DTC P0115 Engine Coolant Temperature (ECT) Sensor Circuit
DTC P0116 Engine Coolant Temperature (ECT) Sensor Performance
DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
DTC P0119 Engine Coolant Temperature Circuit Intermittent
DTC P0120 TP System Performance
DTC P0121 TP Sensor Circuit Insufficient Activity
DTC P0122 Throttle Position (TP) Sensor Circuit Low Voltage
DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage
DTC P0124 Throttle Position Sensor 1 Circuit Intermittent
DTC P0125 Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control
DTC P0126 Insufficient ECT for Stable Operation
DTC P0128 Coolant Thermostat
DTC P0130 HO2S Circuit Closed Loop (CL) Performance Bank 1 Sensor 1
DTC P0131 HO2S Circuit Low Voltage Bank 1 Sensor 1
DTC P0132 HO2S Circuit High Voltage Bank 1 Sensor 1
DTC P0133 HO2S Slow Response Bank 1 Sensor 1
DTC P0134 HO2S Circuit Insufficient Activity Bank 1 Sensor 1
DTC P0135 HO2S Heater Performance Bank 1 Sensor 1
DTC P0136 HO2S Circuit Bank 1 Sensor 2
DTC P0137 HO2S Circuit Low Voltage Bank 1 Sensor 2
DTC P0138 HO2S Circuit High Voltage Bank 1 Sensor 2
DTC P0139 HO2S Slow Response Bank 1 Sensor 2
DTC P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2
DTC P0141 HO2S Heater Performance Bank 1 Sensor 2
DTC P0142 HO2S Circuit Bank 1 Sensor 3
DTC P0143 HO2S Circuit Low Voltage Bank 1 Sensor 3
DTC P0144 HO2S Circuit High Voltage Bank 1 Sensor 3
DTC P0145 HO2S Circuit Bank 1 Sensor 2 Slow Response
DTC P0146 HO2S Circuit Insufficient Activity Bank 1 Sensor 3
DTC P0147 HO2S Heater Performance Bank 1 Sensor 3
DTC P0150 HO2S Circuit Closed Loop (CL) Performance Bank 2 Sensor 1
DTC P0150 HO2S Circuit Bank 2 Sensor 1
DTC P0151 HO2S Circuit Low Voltage Bank 2 Sensor 1
DTC P0152 HO2S Circuit High Voltage Bank 2 Sensor 1
DTC P0153 HO2S Slow Response Bank 2 Sensor 1
DTC P0154 HO2S Circuit Insufficient Activity Bank 2 Sensor 1
DTC P0155 HO2S Heater Performance Bank 2 Sensor 1
DTC P0156 HO2S Circuit Bank 2 Sensor 2
DTC P0157 HO2S Circuit Low Voltage Bank 2 Sensor 2
DTC P0158 HO2S Circuit High Voltage Bank 2 Sensor 2
DTC P0159 HO2S Slow Response Bank 2 Sensor 2
DTC P0160 HO2S Circuit Insufficient Activity Bank 2 Sensor 2
DTC P0161 HO2S Heater Performance Bank 2 Sensor 2
DTC P0162 HO2S Circuit Bank 2 Sensor 3
DTC P0163 HO2S Circuit Bank 2 Sensor 3 Low Voltage
DTC P0164 HO2S Circuit Bank 2 Sensor 3 High Voltage
DTC P0165 HO2S Circuit Bank 2 Sensor 3 Slow Response
DTC P0166 HO2S Circuit Bank 2 Sensor 3 No Activity Detected
DTC P0167 HO2S Heater Circuit Bank 2 Sensor 3
DTC P0169 Fuel Composition Sensor
DTC P0170 Fuel Trim Bank 1
DTC P0171 Fuel Trim System Lean Bank 1
DTC P0172 Fuel Trim System Rich Bank 1
DTC P0173 Fuel Trim Bank 2
DTC P0174 Fuel Trim System Lean Bank 2
DTC P0175 Fuel Trim System Rich Bank 2
DTC P0176 Fuel Composition Sensor Circuit
DTC P0177 Fuel Composition Sensor Circuit Performance
DTC P0178 Fuel Composition Sensor Circuit Low Voltage
DTC P0179 Fuel Composition Sensor Circuit High Voltage
DTC P0180 Fuel Temperature Sensor 1 Circuit
DTC P0181 Fuel Temp. Sensor 1 Circuit Performance
DTC P0182 Fuel Temperature Sensor Circuit Low Voltage
DTC P0183 Fuel Temperature Sensor Circuit High Voltage
DTC P0184 Fuel Temperature Sensor 1 Circuit Intermittent
DTC P0185 Fuel Temperature Sensor 2 Circuit
DTC P0186 Fuel Temp. Sensor 2 Circuit Performance
DTC P0187 Fuel Temperature Sensor 2 Circuit Low Voltage
DTC P0188 Fuel Temperature Sensor 2 Circuit High Voltage
DTC P0189 Fuel Temperature Sensor 2 Circuit Intermittent
DTC P0190 Fuel Rail Pressure Sensor Circuit
DTC P0191 Fuel Rail Pressure Sensor Circuit Performance
DTC P0192 Fuel Rail Pressure Sensor Circuit Low Voltage
DTC P0193 Fuel Rail Pressure Sensor Circuit High Voltage
DTC P0194 Fuel Rail Pressure Sensor Circuit Intermittent
DTC P0195 Engine Oil Temperature Sensor
DTC P0196 Engine Oil Temperature Sensor Performance
DTC P0197 Engine Oil Temperature Sensor Low Voltage
DTC P0198 Engine Oil Temperature Sensor High Voltage
DTC P0199 Engine Oil Temperature Sensor Intermittent
DTC P0200 Injector Control Circuit
DTC P0201 Injector 1 Control Circuit
DTC P0202 Injector 2 Control Circuit
DTC P0203 Injector 3 Control Circuit
DTC P0204 Injector 4 Control Circuit
DTC P0205 Injector 5 Control Circuit
DTC P0206 Injector 6 Control Circuit
DTC P0207 Injector 7 Control Circuit
DTC P0208 Injector 8 Control Circuit
DTC P0209 Injector 9 Control Circuit
DTC P0210 Injector 10 Control Circuit
DTC P0211 Injector 11 Control Circuit
DTC P0212 Injector 12 Control Circuit
DTC P0213 Cold Start Injector 1
DTC P0214 Cold Start Injector 2
DTC P0215 Engine Shutoff Control Circuit
DTC P0216 Injection Timing Control Circuit
DTC P0217 Engine Overtemp Condition
DTC P0218 Transmission Fluid Overtemperature
DTC P0219 Engine Overspeed Condition
DTC P0220 APP Sensor 2 Circuit
DTC P0221 APP Sensor 2 Circuit Performance
DTC P0222 APP Sensor 2 Circuit Low Voltage
DTC P0223 APP Sensor 2 Circuit High Voltage
DTC P0224 Throttle Position Sensor 2 Intermittent
DTC P0225 APP Sensor 3 Circuit
DTC P0226 APP Sensor 3 Circuit Performance
DTC P0227 APP Sensor 3 Circuit Low Voltage
DTC P0228 APP Sensor 3 Circuit High Voltage
DTC P0229 Throttle Position Sensor 3 Intermittent
DTC P0230 Fuel Pump Relay Control Circuit
DTC P0231 Fuel Pump Feedback Circuit Low Voltage
DTC P0232 Fuel Pump Feedback Circuit High Voltage
DTC P0233 Fuel Pump Secondary Circuit Intermittent
DTC P0234 TC Engine Overboost Condition



DTC P0235 Turbocharger Boost Sensor 1 Circuit
DTC P0236 TC Boost System
DTC P0237 TC Boost Sensor Circuit Low Voltage
DTC P0238 TC Boost Sensor Circuit High Voltage
DTC P0239 Turbocharger Boost Sensor 2 Circuit
DTC P0240 Turbocharger Boost Sensor 2 Performance
DTC P0241 Turbocharger Boost Sensor 2 Circuit Low Voltage
DTC P0242 Turbocharger Boost Sensor 2 Circuit High Voltage
DTC P0243 Turbocharger Wastegate Solenoid 1
DTC P0244 Turbocharger Wastegate Solenoid 1 Performance
DTC P0245 Turbocharger Wastegate Solenoid 1 Low Voltage
DTC P0246 Turbocharger Wastegate Solenoid 1 High Voltage
DTC P0247 Turbocharger Wastegate Solenoid 2
DTC P0248 Turbocharger Wastegate Solenoid 2 Performance
DTC P0249 Turbocharger Wastegate Solenoid 2 Low Voltage
DTC P0250 Turbocharger Wastegate Solenoid 2 High Voltage
DTC P0251 Injection Pump Fuel Metering Control "A" Malfunction (Cam/Rotor/Injector)
DTC P0252 Injection Pump Fuel Metering Control "A" Range/Performance (Cam/Rotor/Injector)
DTC P0253 Injection Pump Fuel Metering Control "A" Low (Cam/Rotor/Injector)
DTC P0254 Injection Pump Fuel Metering Control "A" High (Cam/Rotor/Injector)
DTC P0255 Injection Pump Fuel Metering Control "A" Intermittent (Cam/Rotor/Injector)
DTC P0256 Injection Pump Fuel Metering Control "B" Malfunction (Cam/Rotor/Injector)
DTC P0257 Injection Pump Fuel Metering Control "B" Range/Performance (Cam/Rotor/Injector)
DTC P0258 Injection Pump Fuel Metering Control "B" Low (Cam/Rotor/Injector)
DTC P0259 Injection Pump Fuel Metering Control "B" High (Cam/Rotor/Injector)
DTC P0260 Injection Pump Fuel Metering Control "B" Intermittent (Cam/Rotor/Injector)
DTC P0261 Cylinder 1 Injector Circuit Low
DTC P0262 Cylinder 1 Injector Circuit High
DTC P0263 Cylinder 1 Contribution/Balance Fault
DTC P0264 Cylinder 2 Injector Circuit Low
DTC P0265 Cylinder 2 Injector Circuit High
DTC P0266 Cylinder 2 Contribution/Balance Fault
DTC P0267 Cylinder 3 Injector Circuit Low
DTC P0268 Cylinder 3 Injector Circuit High
DTC P0269 Cylinder 3 Contribution/Balance Fault
DTC P0270 Cylinder 4 Injector Circuit Low
DTC P0271 Cylinder 4 Injector Circuit High
DTC P0272 Cylinder 4 Contribution/Balance Fault
DTC P0273 Cylinder 5 Injector Circuit Low
DTC P0274 Cylinder 5 Injector Circuit High
DTC P0275 Cylinder 5 Contribution/Balance Fault
DTC P0276 Cylinder 6 Injector Circuit Low
DTC P0277 Cylinder 6 Injector Circuit High
DTC P0278 Cylinder 6 Contribution/Balance Fault
DTC P0279 Cylinder 7 Injector Circuit Low
DTC P0280 Cylinder 7 Injector Circuit High
DTC P0281 Cylinder 7 Contribution/Balance Fault
DTC P0282 Cylinder 8 Injector Circuit Low
DTC P0283 Cylinder 8 Injector Circuit High
DTC P0284 Cylinder 8 Contribution/Balance Fault
DTC P0285 Cylinder 9 Injector Circuit Low
DTC P0286 Cylinder 9 Injector Circuit High
DTC P0287 Cylinder 9 Contribution/Balance Fault
DTC P0288 Cylinder 10 Injector Circuit Low
DTC P0289 Cylinder 10 Injector Circuit High
DTC P0290 Cylinder 10 Contribution/Balance Fault
DTC P0291 Cylinder 11 Injector Circuit Low
DTC P0292 Cylinder 11 Injector Circuit High
DTC P0293 Cylinder 11 Contribution/Balance Fault
DTC P0294 Cylinder 12 Injector Circuit Low
DTC P0295 Cylinder 12 Injector Circuit High
DTC P0296 Cylinder 12 Contribution/Range Fault
DTC P0300 Engine Misfire Detected
DTC P0301 Cylinder 1 Misfire Detected
DTC P0302 Cylinder 2 Misfire Detected


DTC P0303 Cylinder 3 Misfire Detected
DTC P0304 Cylinder 4 Misfire Detected
DTC P0305 Cylinder 5 Misfire Detected
DTC P0306 Cylinder 6 Misfire Detected
DTC P0307 Cylinder 7 Misfire Detected
DTC P0308 Cylinder 8 Misfire Detected
DTC P0309 Cylinder 9 Misfire Detected
DTC P0311 Cylinder 11 Misfire Detected
DTC P0312 Cylinder 12 Misfire Detected
DTC P0320 Ignition/Distributor Engine Speed Input Circuit Malfunction
DTC P0321 Ignition/Distributor Engine Speed Input Circuit Range/Performance
DTC P0322 IC Module 4X Reference CKT No Frequency
DTC P0323 Ignition/Distributor Engine Speed Input Circuit Intermittent
DTC P0325 PCM Knock Sensor Circuit
DTC P0326 Knock Sensor CKT Excessive Spark Retard
DTC P0327 Knock Sensor Circuit Low Voltage
DTC P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
DTC P0329 Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor)
DTC P0330 Knock Sensor (KS) Circuit Bank 2
DTC P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2)
DTC P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
DTC P0333 Knock Sensor 2 Circuit High Input (Bank 2)
DTC P0334 Knock Sensor 2 Circuit Intermittent (Bank 2)
DTC P0335 CKP Sensor A Circuit Performance
DTC P0336 Crankshaft Position (CKP) Sensor A Performance
DTC P0337 Crankshaft Position (CKP) Sensor Circuit Low Duty Cycle
DTC P0338 Crankshaft Position (CKP) Sensor Circuit High Duty Cycle
DTC P0339 Crankshaft Position (CKP) Sensor Circuit Intermittent
DTC P0340 Camshaft Position (CMP) Sensor Circuit
DTC P0341 Camshaft Position (CMP) Sensor Performance
DTC P0342 Camshaft Position Sensor Circuit Low Input
DTC P0343 Camshaft Position Sensor Circuit High Input
DTC P0344 Camshaft Position Sensor Circuit Intermittent
DTC P0350 Ignition Coil Primary/Secondary Circuit Malfunction
DTC P0351 Ignition Coil 1 Control Circuit
DTC P0352 Ignition Coil 2 Control Circuit
DTC P0353 Ignition Coil 3 Control Circuit
DTC P0354 Ignition Coil 4 Control Circuit
DTC P0355 Ignition Coil 5 Control Circuit
DTC P0356 Ignition Coil 6 Control Circuit
DTC P0357 Ignition Coil 7 Control Circuit
DTC P0358 Ignition Coil 8 Control Circuit
DTC P0359 Ignition Coil I Primary/Secondary Circuit Malfunction
DTC P0360 Ignition Coil J Primary/Secondary Circuit Malfunction
DTC P0361 Ignition Coil K Primary/Secondary Circuit Malfunction
DTC P0362 Ignition Coil L Primary/Secondary Circuit Malfunction
DTC P0370 Timing Reference High Resolution Signal A Malfunction
DTC P0371 IC 24X Reference CKT Too Many Pulses
DTC P0372 IC 24X Reference Circuit Missing Pulses
DTC P0373 Timing Reference High Resolution Signal A Intermittent/Erratic Pulses
DTC P0374 Timing Reference High Resolution Signal A No Pulses
DTC P0375 Timing Reference High Resolution Signal B Malfunction
DTC P0376 Timing Reference High Resolution Signal B Too Many Pulses
DTC P0377 Timing Reference High Resolution Signal B Too Few Pulses
DTC P0378 Timing Reference High Resolution Signal B Intermittent/Erratic Pulses
DTC P0379 Timing Reference High Resolution Signal B No Pulses
DTC P0380 Glow Plug/Heater Circuit "A" Malfunction
DTC P0381 Glow Plug/Heater Indicator Circuit Malfunction
DTC P0382 Exhaust Gas Recirculation Flow Malfunction
DTC P0385 Crankshaft Position (CKP) Sensor B Circuit
DTC P0386 Crankshaft Position (CKP) Sensor B Performance
DTC P0387 Crankshaft Position Sensor B Circuit Low Input
DTC P0388 Crankshaft Position Sensor B Circuit High Input
DTC P0389 Crankshaft Position Sensor B Circuit Intermittent
DTC P0400 Exhaust Gas Recirculation Flow Malfunction
DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient
DTC P0402 Exhaust Gas Recirculation Flow Excessive Detected
DTC P0403 Exhaust Gas Recirculation (EGR) Solenoid Control Circuit
DTC P0404 Exhaust Gas Recirculation (EGR) Open Position Performance
DTC P0405 Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage
DTC P0406 Exhaust Gas Recirculation Sensor A Circuit High
DTC P0407 Exhaust Gas Recirculation Sensor B Circuit Low
DTC P0408 Exhaust Gas Recirculation Sensor B Circuit High
DTC P0410 Secondary Air Injection (AIR) System
DTC P0411 Secondary Air Injection (AIR) System
DTC P0412 Secondary Air Injection (AIR) Solenoid Relay Control Circuit Bank 1
DTC P0413 Secondary Air Injection System Switching Valve A Circuit Open
DTC P0414 Secondary Air Injection System Switching Valve A Circuit Shorted
DTC P0415 Secondary Air Injection System Switching Valve B Circuit Malfunction
DTC P0416 Secondary Air Injection System Switching Valve B Circuit Open
DTC P0417 Secondary Air Injection System Switching Valve B Circuit Shorted
DTC P0418 Secondary Air Injection (AIR) Pump Relay Control Circuit Bank 1
DTC P0419 Secondary Air Injection (AIR) Pump Relay Control Circuit Bank 2
DTC P0420 Catalyst System Low Efficiency
DTC P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
DTC P0422 Catalyst System Low Efficiency Bank 1
DTC P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
DTC P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
DTC P0430 Catalyst System Low Efficiency Bank 2
DTC P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
DTC P0432 Catalyst System Low Efficiency Bank 2
DTC P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)
DTC P0434 Heated Catalyst Temperature Below Threshold (Bank 2)
DTC P0440 Evaporative Emission (EVAP) System
DTC P0441 Evaporative Emission Control System Incorrect Purge Flow
DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected
DTC P0443 EVAP Purge Solenoid Valve 1 Control CKT
DTC P0444 Evaporative Emission Control System Purge Control Valve Circuit Open
DTC P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted
DTC P0446 EVAP Vent Solenoid Valve Control System
DTC P0447 Evaporative Emission Control System Vent Control Circuit Open
DTC P0448 Evaporative Emission Control System Vent Control Circuit Shorted
DTC P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
DTC P0450 Fuel Tank Pressure Sensor Circuit
DTC P0451 Evaporative Emission Control System Pressure Sensor Range/Performance
DTC P0452 Fuel Tank Pressure Sensor Circuit Low Voltage
DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage
DTC P0454 Evaporative Emission Control System Pressure Sensor Intermittent
DTC P0455 Evaporative Emission (EVAP) System Leak Detected
DTC P0460 Fuel Level Sensor Circuit
DTC P0461 Fuel Level Sensor Performance
DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage
DTC P0464 Fuel Level Sensor Circuit Intermittent
DTC P0465 Purge Flow Sensor Circuit Malfunction
DTC P0466 Purge Flow Sensor Circuit Range/Performance
DTC P0467 Purge Flow Sensor Circuit Low Input
DTC P0468 Purge Flow Sensor Circuit High Input
DTC P0469 Purge Flow Sensor Circuit Intermittent
DTC P0470 Exhaust Pressure Sensor Malfunction
DTC P0471 Exhaust Pressure Sensor Range/Performance
DTC P0472 Exhaust Pressure Sensor Low
DTC P0473 Exhaust Pressure Sensor High
DTC P0474 Exhaust Pressure Sensor Intermittent
DTC P0475 Exhaust Pressure Control Valve Malfunction
DTC P0476 Exhaust Pressure Control Valve Range/Performance
DTC P0477 Exhaust Pressure Control Valve Low
DTC P0478 Exhaust Pressure Control Valve High
DTC P0479 Exhaust Pressure Control Valve Intermittent
DTC P0480 Cooling Fan Relay 1 Control Circuit
DTC P0481 Cooling Fan Relay 2 Control Circuit
DTC P0482 Cooling Fan 3 Control Circuit Malfunction
DTC P0483 Cooling Fan Rationality Check Malfunction
DTC P0484 Cooling Fan Circuit Over Current
DTC P0485 Cooling Fan Power/Ground Circuit Malfunction


DTC P0500 Vehicle Speed Sensor (VSS) Circuit
DTC P0501 Vehicle Speed Sensor Range/Performance
DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Input
DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent
DTC P0505 Idle Control System Malfunction
DTC P0506 Idle Speed Low
DTC P0507 Idle Speed High
DTC P0510 Closed Throttle Position Switch Malfunction
DTC P0512 Start Switch Circuit
DTC P0520 Engine Oil Pressure Sensor/Switch Circuit Malfunction
DTC P0521 Engine Oil Pressure Sensor/Switch Circuit Range/Performance
DTC P0522 Engine Oil Pressure Sensor/Switch Circuit Low Voltage
DTC P0523 Engine Oil Pressure Sensor/Switch Circuit High Voltage
DTC P0530 A/C Refrigerant Pressure Sensor Circuit Malfunction
DTC P0531 A/C Refrigerant Pressure Sensor Circuit Range/Performance
DTC P0532 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage
DTC P0533 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit High Voltage
DTC P0534 Air Conditioner Refrigerant Charge Loss
DTC P0550 Power Steering Pressure (PSP) Switch Circuit
DTC P0551 Power Steering Pressure Sensor Circuit Range/Performance
DTC P0552 Power Steering Pressure Sensor Circuit Low Input
DTC P0553 Power Steering Pressure Sensor Circuit High Input
DTC P0554 Power Steering Pressure Sensor Circuit Intermittent
DTC P0560 System Voltage
DTC P0561 System Voltage Unstable
DTC P0562 System Voltage Low
DTC P0563 System Voltage High
DTC P0565 Cruise Control On Signal Malfunction
DTC P0566 Cruise Control Off Signal Malfunction
DTC P0567 Cruise Control Resume Signal Malfunction
DTC P0568 Cruise Control Set Signal Malfunction
DTC P0569 Cruise Control Coast Signal Malfunction
DTC P0570 Cruise Control Accel Signal Malfunction
DTC P0571 Cruise Control Brake Switch Circuit
DTC P0573 Cruise Control/Brake Switch A Circuit High
DTC P0574 Vehicle Speed Too High - Cruise Control Disabled
DTC P0575 Cruise Control Related Malfunction
DTC P0576 Cruise Control Related Malfunction
DTC P0576 Cruise Control Related Malfunction
DTC P0578 Cruise Control Related Malfunction
DTC P0579 Cruise Control Related Malfunction
DTC P0580 Cruise Control Related Malfunction
DTC P0600 Serial Communication Link Malfunction
DTC P0601 Control Module Read Only Memory (ROM)
DTC P0602 Control Module Not Programmed
DTC P0603 Control Module Long Term Memory Reset
DTC P0604 Control Module Random Access Memory (RAM)
DTC P0605 Control Module Programming Read Only Memory (ROM)
DTC P0606 Control Module Internal Performance
DTC P0608 Control Module VSS Output "A" Malfunction
DTC P0609 Control Module VSS Output "B" Malfunction
DTC P0615 Starter Relay Control Circuit
DTC P0620 Generator Control Circuit Malfunction
DTC P0621 Generator L-Terminal Circuit
DTC P0622 Generator F-Terminal Circuit
DTC P0650 Malfunction Indicator Lamp (MIL) Control Circuit
DTC P0654 Engine RPM Output Circuit Malfunction
DTC P0655 Engine Hot Lamp Output Control Circuit Malfucntion
DTC P0656 Fuel Level Output Circuit Malfunction
DTC P0700 Transmission Control System Malfunction
DTC P0701 Transmission Control System Range/Performance
DTC P0702 Transmission Control System Electrical
DTC P0703 Brake Switch Circuit Malfunction
DTC P0704 Clutch Switch Input Circuit Malfunction
DTC P0705 Trans Range Switch Circuit
DTC P0706 Trans Range Switch Performance
DTC P0707 Transmission Range Sensor Circuit Low Input
DTC P0708 Transmission Range Sensor Circuit High Input
DTC P0709 Transmission Range Sensor Circuit Intermittent
DTC P0710 Transmission Fluid Temperature Sensor Circuit Malfunction
DTC P0711 TFT Sensor Circuit Range/Performance
DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Input
DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Input
DTC P0714 Transmission Fluid Temperature Sensor Circuit Intermittent
DTC P0715 Input/Turbine Speed Sensor Circuit Malfunction
DTC P0716 Input Speed Sensor Circuit Intermittent
DTC P0717 Input Speed Sensor Circuit Low Input
DTC P0718 Input/Turbine Speed Sensor Circuit Intermittent
DTC P0719 Brake Switch Circuit Low Input
DTC P0720 Output Speed Sensor Circuit Malfunction
DTC P0721 Output Speed Sensor Range/Performance
DTC P0722 Output Speed Sensor Circuit Low Input
DTC P0723 Output Speed Sensor Intermittent
DTC P0724 Brake Switch Circuit High Input
DTC P0725 Engine Speed Input Circuit
DTC P0726 Engine Speed Input Circuit Range/Performance
DTC P0727 Engine Speed Circuit No Signal
DTC P0728 Engine Speed Input Circuit Intermittent
DTC P0730 Incorrect Gear Ratio
DTC P0731 Incorrect 1st Gear Ratio
DTC P0732 Incorrect 2nd Gear Ratio
DTC P0733 Incorrect 3rd Gear Ratio
DTC P0734 Incorrect 4th Gear Ratio
DTC P0735 Gear 5 Incorrect ratio
DTC P0736 Reverse incorrect gear ratio
DTC P0740 TCC Enable Solenoid Circuit Electrical
DTC P0741 TCC System Stuck Off
DTC P0742 TCC System Stuck On
DTC P0743 TCC Enable Solenoid Circuit Electrical
DTC P0744 Torque Converter Clutch Circuit Intermittent
DTC P0745 Pressure Control Solenoid Malfunction
DTC P0746 Pressure Control Solenoid Performance or Stuck Off
DTC P0747 Pressure Control Solenoid Stuck On
DTC P0748 Pressure Control Solenoid Circuit Electrical
DTC P0749 Pressure Control Solenoid Intermittent
DTC P0750 Shift Solenoid A Malfunction
DTC P0751 1-2 Shift Solenoid Valve Performance - No First or Fourth Gear
DTC P0752 1-2 Shift Solenoid Valve Performance - No Second or Third Gear
DTC P0753 1-2 Shift Solenoid Circuit Electrical
DTC P0754 Shift Solenoid A Intermittent
DTC P0755 Shift Solenoid B Malfunction
DTC P0756 2-3 Shift Solenoid Valve Performance - No First or Second Gear
DTC P0757 2-3 Shift Solenoid Valve Performance - No Third or Fourth Gear
DTC P0758 2-3 Shift Solenoid Circuit Electrical
DTC P0759 Shift Solenoid B Intermittent
DTC P0760 Shift Solenoid C Malfunction
DTC P0761 Shift Solenoid C Performance or Stuck Off
DTC P0762 Shift Solenoid C Stuck On
DTC P0763 Shift Solenoid C Electrical
DTC P0764 Shift Solenoid C Intermittent
DTC P0765 Shift Solenoid D Malfunction
DTC P0766 Shift Solenoid D Performance or Stuck Off
DTC P0767 Shift Solenoid D Stuck On
DTC P0768 Shift Solenoid D Electrical
DTC P0769 Shift Solenoid D Intermittent
DTC P0770 Shift Solenoid E Malfunction
DTC P0771 Shift Solenoid E Performance or Stuck Off
DTC P0772 Shift Solenoid E Stuck On
DTC P0773 Shift Solenoid E Electrical
DTC P0774 Shift Solenoid E Intermittent
DTC P0780 Shift Malfunction
DTC P0781 1-2 Shift Malfunction
DTC P0782 2-3 Shift Malfunction
DTC P0783 3-4 Shift Malfunction
DTC P0784 4-5 Shift Malfunction
DTC P0785 3-2 Shift Solenoid Circuit Electrical
DTC P0786 Shift/Timing Solenoid Range/Performance
DTC P0787 Shift/Timing Solenoid Low
DTC P0788 Shift/Timing Solenoid High
DTC P0789 Shift/Timing Solenoid Intermittent
DTC P0790 Normal/Performance Switch Circuit Malfunction


DTC P0801 Reverse Inhibit Control Circuit Malfunction
DTC P0803 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction
DTC P0804 1-4 Upshift (Skip Shift) Lamp Control Circuit Malfunction
DTC P1031 HO2S Heater Current Monitor Control Circuit Banks 1 and 2 Sensor 1
DTC P1032 HO2S Heater Warm Up Control Circuit Banks 1 and 2 Sensor 1
DTC P1105 Secondary Vacuum Sensor Circuit
DTC P1106 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
DTC P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage
DTC P1108 BARO to MAP Sensor Comparison Too High
DTC P1109 Secondary Port Throttle System
DTC P1111 Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage
DTC P1112 Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
DTC P1113 Intake Resonance Switchover Solenoid Control Circuit
DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage
DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage
DTC P1116 ECT Signal Unstable or Intermittent
DTC P1117 Engine Coolant Temp. Signal Out-Of-Range Low
DTC P1118 Engine Coolant Temp. Signal Out-Of-Range High
DTC P1119 ECT Signal Out-Of-Range With TFT Sensor
DTC P1120 Throttle Position (TP) Sensor 1 Circuit
DTC P1121 Throttle Position (TP) Sensor Circuit Intermittent High Voltage
DTC P1122 Throttle Position (TP) Sensor Circuit Intermittent Low Voltage
DTC P1125 APP System
DTC P1130 HO2S Circuit Low Variance Bank 1 Sensor 1
DTC P1131 HO2S Circuit Low Variance Bank 1 Sensor 2
DTC P1132 HO2S Circuit Low Variance Bank 2 Sensor 1
DTC P1133 HO2S Insufficient Switching Bank 1 Sensor 1
DTC P1134 HO2S Transition Time Ratio Bank 1 Sensor 1
DTC P1135 HO2S Lean Mean Bank 1 Sensor 1
DTC P1136 HO2S Rich Mean Bank 1 Sensor 1
DTC P1137 HO2S Bank 1 Sensor 2 Lean System or Low Voltage
DTC P1138 HO2S Bank 1 Sensor 2 Rich or High Voltage
DTC P1139 HO2S Insuff. Switching Bank 1 Sensor 2
DTC P1140 HO2S Transition Time Ratio Bank 1 Sensor 2
DTC P1141 HO2S Heater Control Circuit Bank 1 Sensor 2
DTC P1143 HO2S Bank 1 Sensor 3 Lean System or Low Voltage
DTC P1144 HO2S Bank 1 Sensor 3 Rich or High Voltage
DTC P1145 HO2S Cross Counts Bank 1 Sensor 3
DTC P1153 HO2S Insufficient Switching Bank 2 Sensor 1
DTC P1154 HO2S Transition Time Ratio Bank 2 Sensor 1
DTC P1155 HO2S Lean Mean Bank 2 Sensor 1
DTC P1156 HO2S Rich Mean Bank 2 Sensor 1
DTC P1157 HO2S Bank 2 Sensor 2 Lean System or Low Voltage
DTC P1158 HO2S Bank 2 Sensor 2 Rich or High Voltage
DTC P1159 HO2S Cross Counts Bank 2 Sensor 2
DTC P1161 HO2S Heater Control Circuit Bank 2 Sensor 2
DTC P1163 HO2S Bank 2 Sensor 3 Lean System or Low Voltage
DTC P1164 HO2S Bank 2 Sensor 3 Rich or High Voltage
DTC P1165 HO2S Cross Counts Bank 2 Sensor 3
DTC P1170 Bank to Bank Fuel TrimOffset
DTC P1171 Fuel System Lean During Acceleration
DTC P1185 Engine Oil Temperature Circuit
DTC P1186 EOT Circuit Performance
DTC P1187 EOT Sensor Ckt. Low Voltage
DTC P1188 EOT Sensor Ckt. High Voltage
DTC P1189 Engine Oil Pressure (EOP) Switch Circuit
DTC P1190 Engine Vacuum Leak
DTC P1191 Intake Air Duct Air Leak
DTC P1200 Injector Control Circuit
DTC P1201 (Alt. Fuel) Gas Mass Sensor Circuit Range/Performance
DTC P1202 (Alt. Fuel) Gas Mass Sensor Circuit Low Frequency
DTC P1203 (Alt. Fuel) Gas Mass Sensor Circuit High Frequency
DTC P1211 Mass Air Flow Circuit Intermittent High
DTC P1212 Mass Air Flow Circuit Intermittent Low
DTC P1214 Injection Pump Timing Offset
DTC P1215 Ground Fault Detection Indicated
DTC P1216 Fuel Solenoid Response Time Too Short
DTC P1217 Fuel Solenoid Response Time Too Long
DTC P1218 Injection Pump Calibration Circuit
DTC P1219 Throttle Position Sensor Reference Voltage
DTC P1220 Throttle Position (TP) Sensor 2 Circuit
DTC P1221 Fuel Pump Secondary Circuit Low
DTC P1222 Injector Control Circuit Intermittent
DTC P1225 Injector Circuit Cylinder 2 Intermittent
DTC P1228 Injector Circuit Cylinder 3 Intermittent
DTC P1231 Injector Circuit Cylinder 4 Intermittent
DTC P1234 Injector Circuit Cylinder 5 Intermittent
DTC P1237 Injector Circuit Cylinder 6 Intermittent
DTC P1240 Injector Circuit Cylinder 7 Intermittent
DTC P1243 Injector Circuit Cylinder 8 Intermittent
DTC P1245 Intake Plenum Switchover Valve
DTC P1250 Early Fuel Evaporation Heater Circuit
DTC P1257 Supercharger System Overboost
DTC P1258 Engine Coolant Overtemperature - Protection Mode Active
DTC P1260 Last Test Failed Failed SCC ENTER:More Info.
DTC P1270 Accelerator Pedal Position Sensor A/D Converter Error
DTC P1271 Accelerator Pedal Position (APP) Sensor 1-2 Correlation
DTC P1272 Accelerator Pedal Position Sensor 2
DTC P1273 "Accelerator Pedal Position Sensor 1
DTC P1274 Injectors Wired Incorrectly
DTC P1275 Accelerator Pedal Position (APP) Sensor 1 Circuit
DTC P1276 Accelerator Pedal Position Sensor 1 Circuit Performance
DTC P1277 Accelerator Pedal Position Sensor 1 Circuit Low Voltage
DTC P1278 Accelerator Pedal Position Sensor 1 Circuit High Voltage
DTC P1280 Accelerator Pedal Position (APP) Sensor 2 Circuit
DTC P1281 Accelerator Pedal Position Sensor 2 Circuit Performance
DTC P1282 Accelerator Pedal Position Sensor 2 Circuit Low Voltage
DTC P1283 Accelerator Pedal Position Sensor 2 Circuit High Voltage
DTC P1285 Accelerator Pedal Position Sensor 3 Circuit
DTC P1286 Accelerator Pedal Position Sensor 3 Circuit Performance
DTC P1287 Accelerator Pedal Position Sensor 3 Circuit Low Voltage
DTC P1288 Accelerator Pedal Position Sensor 3 Circuit High Voltage
DTC P1300 Ignitor Circuit
DTC P1305 Ignition Coil 2 Primary Feedback Circuit
DTC P1310 Ignition Coil 3 Primary Feedback Circuit
DTC P1315 Ignition Coil 4 Primary Feedback Circuit
DTC P1320 IC 4X Reference Circuit Intermittent
DTC P1321 Electronic Ignition System Fault Line
DTC P1322 EI System or Ignition Control Extra or Missing
DTC P1323 IC 24X Reference Circuit Low Frequency
DTC P1324 Crank RPM Too Low
DTC P1335 CKP Circuit
DTC P1336 Crankshaft Position (CKP) System Variation Not Learned
DTC P1345 Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation
DTC P1346 Intake Camshaft Position [CMP] Sensor System Performance
DTC P1350 Ignition Control System
DTC P1351 Ignition Coil Control Circuit High Voltage
DTC P1352 IC Output High/Pulse Detected when GND_Cyl. 2
DTC P1353 IC Output High/Pulse Detected when GND_Cyl. 3
DTC P1354 IC Output High/Pulse Detected when GND_Cyl. 4
DTC P1355 IC Output High/Pulse Detected when GND_Cyl. 5
DTC P1356 IC Output High/Pulse Detected when GND_Cyl. 6
DTC P1357 IC Output High/Pulse Detected when GND_Cyl. 7
DTC P1358 IC Output High/Pulse Detected when GND_Cyl. 8
DTC P1359 Ignition Coil Group 1 Control Circuit
DTC P1360 Ignition Coil Group 2 Control Circuit
DTC P1361 Ignition Coil Control Circuit Low Voltage
DTC P1362 IC Cylinder 2 Not Toggling After Enable
DTC P1363 IC Cylinder 3 Not Toggling After Enable
DTC P1364 IC Cylinder 4 Not Toggling After Enable
DTC P1365 IC Cylinder 5 Not Toggling After Enable
DTC P1366 IC Cylinder 6 Not Toggling After Enable
DTC P1367 IC Cylinder 7 Not Toggling After Enable
DTC P1368 IC Cylinder 8 Not Toggling After Enable
DTC P1370 IC 4X Reference Circuit Too Many Pulses
DTC P1371 IC 4X Reference Circuit Too Few Pulses
DTC P1372 Crankshaft Position (CKP) Sensor A-B Correlation
DTC P1374 3X Reference Circuit
DTC P1375 IC 24X Reference Circuit High Voltage
DTC P1376 Ignition Ground Circuit
DTC P1377 IC Cam Pulse To 4X Reference Pulse
DTC P1380 Misfire Detected - Rough Road Data Not Available
DTC P1381 Misfire Detected - No Communication with Brake Control Module
DTC P1390 Wheel Speed Sensor 1 - G - Sensor Circuit
DTC P1391 Wheel Speed Sensor 1 - G - Sensor Circuit Performance
DTC P1392 Wheel Speed Sensor 1 - G - Sensor Circuit Low Voltage
DTC P1393 Wheel Speed Sensor 1 - G - Sensor Circuit High Voltage
DTC P1394 Wheel Speed Sensor 1 - G - Sensor Circuit Intermittent
DTC P1395 Wheel Speed Sensor 2 - G - Sensor Circuit
DTC P1396 Wheel Speed Sensor 2 - G - Sensor Circuit Performance
DTC P1397 Wheel Speed Sensor 2 - G - Sensor Circuit Low Voltage
DTC P1398 Wheel Speed Sensor 2 - G - Sensor Circuit High Voltage
DTC P1399 Wheel Speed Sensor 2 - G - Sensor Circuit Intermittent
DTC P1403 Exhaust Gas Recirculation System Valve 1
DTC P1404 Exhaust Gas Recirculation (EGR) Closed Position Performance
DTC P1405 Exhaust Gas Recirculation System Valve 3
DTC P1406 EGR Valve Pintle Position Circuit
DTC P1407 EGR Air Intrusion in Exhaust Supply to EGR Valve
DTC P1408 Intake Manifold Pressure Sensor Circuit
DTC P1409 EGR Vacuum System Leak
DTC P1410 Fuel Tank Pressure System
DTC P1415 Secondary Air Injection (AIR) System Bank 1
DTC P1416 Secondary Air Injection (AIR) System Bank 2
DTC P1418 Secondary Air Injection System Relay A Control Circuit High
DTC P1420 Intake Air Low Pressure Switch Circuit Low Voltage
DTC P1421 Intake Air Low Pressure Switch Circuit High Voltage
DTC P1423 Intake Air High Pressure Switch Circuit High Voltage
DTC P1431 Fuel Level Sensor 2 Circuit Performance
DTC P1432 Fuel Level Sensor 2 Circuit Low Voltage
DTC P1433 Fuel Level Sensor 2 Circuit High Voltage
DTC P1441 Evaporative Emission (EVAP) System Flow During Non-Purge
DTC P1442 EVAP Vacuum Sw. High Voltage During Ign. On
DTC P1450 Barometric Pressure Sensor Circuit
DTC P1451 Barometric Press. Sensor Performance
DTC P1460 Cooling Fan Control System
DTC P1460 Misfire Detected With Low Fuel Level
DTC P1480 Cooling Fan 1 Control Circuit High
DTC P1483 Engine Cooling System Performance


DTC P1500 Starter Signal Circuit
DTC P1501 Theft Deterrent System
DTC P1501 Vehicle Speed Sensor Circuit Intermittent
DTC P1502 Theft Deterrent Fuel Enable Signal Not Received
DTC P1503 Theft Deterrent Fuel Enable Signal Not Correct
DTC P1504 Vehicle Speed Output Circuit
DTC P1508 Idle Speed Low - Idle Air Control (IAC) System Not Responding
DTC P1509 Idle Speed High - Idle Air Control (IAC) System Not Responding
DTC P1510 Throttle Control System Performance - Throttle Limitation Active
DTC P1511 Throttle Control System - Backup System Performance
DTC P1514 Airflow to TP Sensor Correlation High
DTC P1515 Electronic Throttle System Throttle Position
DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
DTC P1517 Electronic Throttle Module
DTC P1518 Electronic Throttle Module to PCM Communication
DTC P1519 Throttle Actuator Control (TAC) Module Internal Circuit
DTC P1520 Transmission Range Switch Circuit
DTC P1521 Transmission Engaged at High Throttle Angle
DTC P1522 Park/Neutral to Drive/Reverse at High RPM
DTC P1523 Throttle Closed Position Performance
DTC P1524 Throttle Closed Position Performance
DTC P1525 Throttle Body ServiceRequired
DTC P1526 Minimum Throttle Position Not Learned
DTC P1527 Transmission Range to Pressure Switch Correlation
DTC P1528 Governor
DTC P1529 Heated Windshield Request Problem
DTC P1530 Throttle Actuator Control (TAC) Module Internal Circuit
DTC P1531 A/C Low Side Temperature Sensor Fault
DTC P1532 A/C Evaporator Temp. Sens. Ckt. Low Voltage
DTC P1533 A/C Evaporator Temp. Sens. Ckt. High Voltage
DTC P1534 A/C High Side Temp. Sensor Low Voltage
DTC P1535 A/C High Side Temperature Sensor Circuit
DTC P1536 Engine Coolant Overtemperature - Air Conditioning (A/C) Disabled
DTC P1537 A/C Request Circuit Low Voltage
DTC P1538 A/C Request Circuit High Voltage
DTC P1539 A/C Clutch Status Circuit High Voltage
DTC P1540 Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) Disabled
DTC P1541 A/C High Side Over Temperature
DTC P1542 A/C System High Pressure High Temperature
DTC P1543 A/C System Performance
DTC P1544 A/C Refrigerant Condition Very Low
DTC P1545 Air Conditioning (A/C) Clutch Relay Control Circuit
DTC P1546 A/C Clutch Status Circuit Low Voltage
DTC P1547 A/C System Performance Degraded
DTC P1548 A/C Recirculation Circuit
DTC P1554 Cruise Control Feedback Circuit
DTC P1555 Electronic Variable Orifice Output
DTC P1558 Cruise Control Servo Indicates Low
DTC P1559 Cruise Control Power Management Mode
DTC P1560 Transaxle Not in Drive - Cruise Control Disabled
DTC P1561 Cruise Vent Solenoid
DTC P1562 Cruise Vacuum Solenoid
DTC P1563 Cruise Vehicle Speed/Set Speed Difference Too High
DTC P1564 Vehicle Acceleration Too High - Cruise Control Disabled
DTC P1565 Cruise Servo Position Sensor
DTC P1566 Engine RPM Too High - Cruise Control Disabled
DTC P1567 Active Banking Control Active - Cruise Control Disabled
DTC P1568 Cruise Servo Stroke Greater than Commanded in Cruise
DTC P1569 Cruise Servo Stroke High While not in Cruise
DTC P1570 Traction Control Active - Cruise Control Disabled
DTC P1571 Traction Control Torque Request Circuit
DTC P1572 ASR Active Circuit Low Too Long
DTC P1573 PCM/EBTCM Serial Data Circuit
DTC P1574 Stoplamp Switch Circuit
DTC P1575 Extended Travel Brake Switch Circuit
DTC P1576 BBV Sensor Ckt. High Voltage
DTC P1577 BBV Sensor Ckt. Low Voltage
DTC P1578 BBV Sensor Ckt. Low Vacuum
DTC P1579 P/N to D/R at High Throttle Angle - Power Reduction Mode Active
DTC P1580 Cruise Move Circuit Low Voltage
DTC P1581 Cruise Move Circuit High Voltage
DTC P1582 Cruise Direction Circuit Low Voltage
DTC P1583 Cruise Direction CircuitHigh Voltage
DTC P1584 Cruise Control Disabled
DTC P1585 Cruise Control Inhibit Output Circuit
DTC P1586 Cruise Control Brake Switch 2 Circuit
DTC P1587 Cruise Control Clutch Control Circuit Low
DTC P1588 Cruise Control Clutch Control Circuit High
DTC P1599 Engine Stall or Near Stall Detected
DTC P1600 TCM Internal Watchdog Operation
DTC P1601 Serial Comm. Problem With Device 1
DTC P1602 Knock Sensor (KS) Module Performance
DTC P1603 Loss of SDM Serial Data
DTC P1604 Loss of IPC Serial Data
DTC P1605 Loss of HVAC Serial Data
DTC P1606 Serial Communication Problem With Device 6
DTC P1607 Serial Communication Problem With Device 7
DTC P1608 Serial Communication Problem With Device 8
DTC P1609 Loss Of TCS Serial Data
DTC P1610 Loss of PZM Serial Data
DTC P1611 Loss of CVRTD Serial Data
DTC P1612 Loss of IPM Serial Data
DTC P1613 Loss of DIM Serial Data
DTC P1614 Loss of RIM Serial Data
DTC P1615 Loss of VTD Serial Data
DTC P1617 Engine Oil Level Switch Circuit
DTC P1619 Engine Oil Life Monitor Reset Circuit
DTC P1620 Low Coolant Circuit
DTC P1621 Control Module Long Term Memory Performance
DTC P1622 Cylinder Select
DTC P1623 Transmission Temp Pull-Up Resistor
DTC P1624 Customer Snapshot Requested - Data Available
DTC P1625 TCM System Reset
DTC P1626 Theft Deterrent Fuel Enable Signal Not Received
DTC P1627 A/D Performance
DTC P1628 ECT Pull-Up Resistor
DTC P1629 Theft Deterrent System - Cranking Signal
DTC P1630 Theft Deterrent Learn Mode Active
DTC P1631 Theft Deterrent Start Enable Signal Not Correct
DTC P1632 Theft Deterrent Fuel Disable Signal Received
DTC P1633 Ignition 0 Switch Circuit
DTC P1634 Ignition 1 Switch Circuit
DTC P1635 5 Volt Reference Circuit
DTC P1636 PCM Stack Overrun
DTC P1637 Generator L-Terminal Circuit
DTC P1638 Generator F-Terminal Circuit
DTC P1639 5 Volt Reference 2 Circuit
DTC P1640 Driver-1-Input High Voltage
DTC P1641 Malfunction Indicator Lamp (MIL) Control Circuit
DTC P1642 Vehicle Speed Output Circuit
DTC P1643 Engine Speed Output Circuit
DTC P1644 Traction Control Delivered Torque Output Circuit
DTC P1645 Evaporative Emission (EVAP) Vent Solenoid Contorl Circuit
DTC P1646 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
DTC P1647 Driver 1 Line 7
DTC P1650 Control Module Output B Circuit
DTC P1651 Fan 1 Relay Control Circuit
DTC P1652 Powertrain Induced Chassis Pitch Output Circuit
DTC P1653 Oil Level Lamp Control Circuit
DTC P1654 Cruise Control Inhibit Output Circuit
DTC P1655 EVAP Purge Solenoid Control Circuit
DTC P1656 Driver 2 Line 6
DTC P1657 1-4 Upshift Solenoid Control Circuit
DTC P1658 Starter Enable Relay Control Circuit
DTC P1660 Cooling Fan Control Circuits
DTC P1661 MIL Control Circuit
DTC P1662 Cruise Lamp Control Circuit
DTC P1663 Oil Life Lamp Control Circuit
DTC P1664 1-4 Upshift Lamp Control Circuit
DTC P1665 Driver 3 Line 5
DTC P1666 Driver 3 Line 6
DTC P1667 Reverse Inhibit Solenoid Control Circuit
DTC P1669 ABS Unit Expected
DTC P1670 Driver 4
DTC P1671 Driver 4 Line 1
DTC P1672 Low Engine Oil Level Lamp Control Circuit
DTC P1673 Engine Hot Lamp Control Circuit
DTC P1674 Tachometer Control Circuit
DTC P1675 EVAP Vent Solenoid Control Circuit
DTC P1676 Driver 4 Line 6
DTC P1677 Driver 4 Line 7
DTC P1680 Driver 5
DTC P1681 Driver 5 Line 1
DTC P1682 Driver 5 Line 2
DTC P1683 Driver 5 Line 3
DTC P1684 Driver 5 Line 4
DTC P1685 Driver 5 Line 5
DTC P1686 Driver 5 Line 6
DTC P1687 Driver 5 Line 7
DTC P1689 Delivered Torque Circuit Fault
DTC P1690 ECM Loop Overrun
DTC P1691 Coolant Gage Circuit Low Voltage
DTC P1692 Coolant Gage Circuit High Voltage
DTC P1693 Tachometer Circuit Low Voltage
DTC P1694 Tachometer Circuit High Voltage
DTC P1695 Remote Keyless Entry Circuit Low
DTC P1696 Remote Keyless Entry Voltage High
DTC P1700 Transmission Control Module (TCM) Requested MIL Illumination
DTC P1701 Trans. MIL Request Circuit
DTC P1705 P/N Signal Output Circuit
DTC P1740 Torque Reduction Signal Circuit
DTC P1743 TP Signal from ECM
DTC P1760 TCM Supply Voltage Interrupted
DTC P1779 Engine Torque Delivered to TCM Signal
DTC P1780 Park/Neutral Position [PNP] Switch Circuit
DTC P1781 Engine Torque Signal Circuit
DTC P1790 Transmission Control Module Checksum
DTC P1791 Transmission Control Module Loop
DTC P1792 Transmission Control Module Reprogrammable Memory
DTC P1792 ECM to TCM Engine Coolant Signal
DTC P1793 Transmission Control Module Stack Overrun
DTC P1795 CAN Bus - Throttle Body Position
DTC P1800 TCM Power Relay Control Circuit
DTC P1801 Performance Selector Switch Failure
DTC P1804 Ground Control Relay
DTC P1810 TFP Valve Position Switch Circuit
DTC P1811 Maximum Adapt and Long Shift

DTC P1812 Transmission Over Temperature Condition
DTC P1813 Torque Control
DTC P1814 Torque Converter Overstressed
DTC P1815 Transmission Range Switch - Start In Wrong Range
DTC P1816 TFP Valve Position Sw. - Park/Neu. With Drive Ratio
DTC P1817 TFP Valve Position Sw. - Reverse With Drive Ratio
DTC P1818 TFP Valve Position Sw. - Drive Without Drive Ratio
DTC P1819 Internal Mode Switch - No Start\Wrong Range
DTC P1820 Internal Mode Switch Circuit A Low
DTC P1822 Internal Mode Switch Circuit B High
DTC P1823 Internal Mode Switch Circuit P Low
DTC P1825 Internal Mode Switch - Invalid Range
DTC P1826 Internal Mode Switch Circuit C - High
DTC P1831 PC Solenoid Power Circuit - Low Voltage
DTC P1833 A/T Solenoids Power Circuit - Low Voltage
DTC P1835 Kick-Down Switch Circuit
DTC P1836 Kick-Down Switch Failed Open
DTC P1837 Kick-Down Switch Failed Short
DTC P1842 1-2 Shift Solenoid Circuit Low Voltage
DTC P1843 1-2 Shift Solenoid Circuit High Voltage
DTC P1844 Torque Reduction Signal Circuit Desired By TCM
DTC P1845 2-3 Shift Solenoid Circuit Low Voltage
DTC P1847 2-3 Shift Solenoid Circuit High Voltage
DTC P1850 Brake Band Apply Solenoid Circuit
DTC P1851 Brake Band Apply Solenoid Performance
DTC P1852 Brake Band Apply SolenoidLow Voltage
DTC P1853 Brake Band Apply Solenoid High Voltage
DTC P1860 TCC PWM Solenoid Circuit Electrical
DTC P1864 Torque Converter Clutch Circuit
DTC P1868 Transmission Fluid Life
DTC P1870 Transmission Component Slipping
DTC P1871 Undefined Gear Ratio
DTC P1873 TCC Stator Temp. Switch Circuit Low
DTC P1874 TCC Stator Temp. Switch Circuit High
DTC P1875 4WD Low Switch Circuit Electrical
DTC P1884 TCC Enable/Shift Light Circuit
DTC P1886 Shift Timing Solenoid
DTC P1887 TCC Release Switch Circuit
DTC P1890 ECM Data Input Circuit
DTC P1890 Throttle Position Signal Input
DTC P1891 Throttle Position Sensor PWM Signal Low
DTC P1892 Throttle Position Sensor PWM Signal High
DTC P1893 Engine Torque Signal Low Voltage
DTC P1894 Engine Torque Signal High Voltage
DTC P1895 TCM to ECM Torque Reduction Circuit

Network Codes:

DTC U1000 Class 2 Communication Malfunction
DTC U1001-U1254 Loss of XXX Communications
DTC U1002 Loss of serial communications for class 2 devices
DTC U1003 Loss of serial communications for class 2 devices
DTC U1004 Loss of serial communications for class 2 devices
DTC U1005 Loss of serial communications for class 2 devices
DTC U1006 Loss of serial communications for class 2 devices
DTC U1007 Loss of serial communications for class 2 devices
DTC U1008 Loss of serial communications for class 2 devices
DTC U1009 Loss of serial communications for class 2 devices
DTC U1010 Loss of serial communications for class 2 devices
DTC U1011 Loss of serial communications for class 2 devices
DTC U1012 Loss of serial communications for class 2 devices
DTC U1013 Loss of serial communications for class 2 devices
DTC U1014 Loss of serial communications for class 2 devices
DTC U1015 Loss of serial communications for class 2 devices
DTC U1016 Loss of Class 2 Communication with VCM
DTC U1016 Loss of Communications with PCM
DTC U1017 Loss of serial communications for class 2 devices
DTC U1018 Loss of serial communications for class 2 devices
DTC U1019 Loss of serial communications for class 2 devices
DTC U1020 Loss of serial communications for class 2 devices
DTC U1021 Loss of serial communications for class 2 devices
DTC U1022 Loss of serial communications for class 2 devices
DTC U1023 Loss of serial communications for class 2 devices
DTC U1024 Loss of serial communications for class 2 devices
DTC U1025 Loss of serial communications for class 2 devices
DTC U1026 Loss of ATC Class 2 Communication
DTC U1027 Loss of serial communications for class 2 devices
DTC U1028 Loss of serial communications for class 2 devices
DTC U1029 Loss of serial communications for class 2 devices
DTC U1030 Loss of serial communications for class 2 devices
DTC U1031 Loss of serial communications for class 2 devices
DTC U1032 Loss of serial communications for class 2 devices
DTC U1033 Loss of serial communications for class 2 devices
DTC U1034 Loss of serial communications for class 2 devices
DTC U1035 Loss of serial communications for class 2 devices
DTC U1036 Loss of serial communications for class 2 devices
DTC U1037 Loss of serial communications for class 2 devices
DTC U1038 Loss of Serial Communications for Class 2 Devices
DTC U1039 Loss of Serial Communications for Class 2 Devices
DTC U1040 Loss of Class 2 Communications with ABS
DTC U1041 Loss of EBCM Communication
DTC U1042 Lost Communications with Brake/Traction Control System
DTC U1043 Loss of Serial Communications for Class 2 Devices
DTC U1044 Loss of Serial Communications for Class 2 Devices
DTC U1045 Loss of Serial Communications for Class 2 Devices
DTC U1046 Loss of Serial Communications for Class 2 Devices
DTC U1047 Loss of Serial Communications for Class 2 Devices
DTC U1048 Loss of Serial Communications for Class 2 Devices
DTC U1049 Loss of Serial Communications for Class 2 Devices
DTC U1050 Loss of Serial Communications for Class 2 Devices
DTC U1051 Loss of Serial Communications for Class 2 Devices
DTC U1052 Loss of Serial Communications for Class 2 Devices
DTC U1053 Loss of Serial Communications for Class 2 Devices
DTC U1054 Loss of Serial Communications for Class 2 Devices
DTC U1055 Loss of Serial Communications for Class 2 Devices
DTC U1056 Loss of Communications with RSS
DTC U1057 Loss of Serial Communications for Class 2 Devices
DTC U1058 Loss of Serial Communications for Class 2 Devices
DTC U1059 Loss of Serial Communications for Class 2 Devices
DTC U1060 Loss of Serial Communications for Class 2 Devices
DTC U1161 Loss of PDM Serial Data
DTC U1062 Loss of Serial Communications for Class 2 Devices
DTC U1163 Loss of RRDM Serial Data
DTC U1064 Loss of Communications with DIM
DTC U1065 Loss of Communications with IPM
DTC U1066 Loss of Communications with RIM
DTC U1067 Loss of Serial Communications for Class 2 Devices
DTC U1068 Loss of Serial Communications for Class 2 Devices
DTC U1069 Loss of Serial Communications for Class 2 Devices
DTC U1170 Loss of Driver Door Sw Asm Serial Data
DTC U1071 Loss of Serial Communications for Class 2 Devices
DTC U1072 Loss of Serial Communications for Class 2 Devices
DTC U1073 Loss of Serial Communications for Class 2 Devices
DTC U1074 Loss of Serial Communications for Class 2 Devices
DTC U1075 Loss of Serial Communications for Class 2 Devices
DTC U1076 Loss of Serial Communications for Class 2 Devices
DTC U1077 Loss of Serial Communications for Class 2 Devices
DTC U1078 Loss of Serial Communications for Class 2 Devices
DTC U1079 Loss of Serial Communications for Class 2 Devices
DTC U1080 Loss of Serial Communications for Class 2 Devices
DTC U1081 Loss of Serial Communications for Class 2 Devices
DTC U1082 Loss of Serial Communications for Class 2 Devices
DTC U1083 Loss of Serial Communications for Class 2 Devices
DTC U1084 Loss of Serial Communications for Class 2 Devices
DTC U1085 Loss of Serial Communications for Class 2 Devices
DTC U1086 Loss of Serial Communications for Class 2 Devices
DTC U1087 Loss of Serial Communications for Class 2 Devices
DTC U1088 Loss of Communications with SDM
DTC U1089 Loss of Serial Communications for Class 2 Devices
DTC U1090 Loss of Serial Communications for Class 2 Devices
DTC U1091 Loss of Serial Communications for Class 2 Devices
DTC U1092 Loss of Serial Communications for Class 2 Devices
DTC U1093 Loss of Serial Communications for Class 2 Devices
DTC U1094 Loss of Serial Communications for Class 2 Devices
DTC U1095 Loss of Serial Communications for Class 2 Devices



DTC P1812 Transmission Over Temperature Condition
DTC P1813 Torque Control
DTC P1814 Torque Converter Overstressed
DTC P1815 Transmission Range Switch - Start In Wrong Range
DTC P1816 TFP Valve Position Sw. - Park/Neu. With Drive Ratio
DTC P1817 TFP Valve Position Sw. - Reverse With Drive Ratio
DTC P1818 TFP Valve Position Sw. - Drive Without Drive Ratio
DTC P1819 Internal Mode Switch - No Start\Wrong Range
DTC P1820 Internal Mode Switch Circuit A Low
DTC P1822 Internal Mode Switch Circuit B High
DTC P1823 Internal Mode Switch Circuit P Low
DTC P1825 Internal Mode Switch - Invalid Range
DTC P1826 Internal Mode Switch Circuit C - High
DTC P1831 PC Solenoid Power Circuit - Low Voltage
DTC P1833 A/T Solenoids Power Circuit - Low Voltage
DTC P1835 Kick-Down Switch Circuit
DTC P1836 Kick-Down Switch Failed Open
DTC P1837 Kick-Down Switch Failed Short
DTC P1842 1-2 Shift Solenoid Circuit Low Voltage
DTC P1843 1-2 Shift Solenoid Circuit High Voltage
DTC P1844 Torque Reduction Signal Circuit Desired By TCM
DTC P1845 2-3 Shift Solenoid Circuit Low Voltage
DTC P1847 2-3 Shift Solenoid Circuit High Voltage
DTC P1850 Brake Band Apply Solenoid Circuit
DTC P1851 Brake Band Apply Solenoid Performance
DTC P1852 Brake Band Apply SolenoidLow Voltage
DTC P1853 Brake Band Apply Solenoid High Voltage
DTC P1860 TCC PWM Solenoid Circuit Electrical
DTC P1864 Torque Converter Clutch Circuit
DTC P1868 Transmission Fluid Life
DTC P1870 Transmission Component Slipping
DTC P1871 Undefined Gear Ratio
DTC P1873 TCC Stator Temp. Switch Circuit Low
DTC P1874 TCC Stator Temp. Switch Circuit High
DTC P1875 4WD Low Switch Circuit Electrical
DTC P1884 TCC Enable/Shift Light Circuit
DTC P1886 Shift Timing Solenoid
DTC P1887 TCC Release Switch Circuit
DTC P1890 ECM Data Input Circuit
DTC P1890 Throttle Position Signal Input
DTC P1891 Throttle Position Sensor PWM Signal Low
DTC P1892 Throttle Position Sensor PWM Signal High
DTC P1893 Engine Torque Signal Low Voltage
DTC P1894 Engine Torque Signal High Voltage
DTC P1895 TCM to ECM Torque Reduction Circuit

1998 Chevy Cavalier Z24 2.4L Quad 4 Twin CAM LD9 Repair Shake Down

1998 Chevy Cavalier Z24 2.4L Repair
1998 Chevy Cavalier Z24 2.4L Quad 4 Twin CAM LD9 Repair Shake Down On A 1998 Chevy Cavalier Z24 2.4L Quad 4 Twin CAM LD9 Engine With 285,000K.

1998 Chevy Cavalier Z24 2.4L LD9 Misfire Conditions:


  1. P0131 - 02 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 1
  2. P0134 - 02 SENSOR CIRCUIT NO ACTIVITY DETECTED BANK 1 SENSOR 1
  3. P1133 - MANUFACTURER CONTROL

    DTC P1133 - O2S Insufficent Switching Sensor 1

    Note: See The 2.4L wiring Diagrams for circuit reference.

    Circuit Description

    The Powertrain Control Module Or The PCM Continuously Monitors The Oxygen Sensor 1 OS2 1 Activity For A Period Of 100 Seconds. During The Monitor Period, The Powertrain Control Module Or The PCM Counts The Number Of Times That The OS2 1 Switches From Rich To Lean And From Lean To Rich. If The Powertrain Control Module Detects That The Total Number Of Switches Is Less Then The Pre Calibrated Value The Powertrain Control Module Or PCM Will Set DCT P1133 - O2S Insufficent Switching Sensor 1.
  4. P0171 - SYSTEM TOO LEAN BANK 1
  5. P0502 - VEHICAL SPEED SENSOR CIRCUIT LOW
  6. P0131 - 02 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 1
  7. P0172 - SYSTEM TOO RICH BANK 1



Bad MAP Sensor Tests 1998 Chevy Cavalier Z24 2.4L LD9

1998 Chevy Cavalier Z24 2.4L LD9 Bad MAP Sensor Tests
1998 Chevy Cavalier Suspected Bad MAP Sensor Tests. When the MAP Sensor goes BAD on your GM 2.4L Quad 4 equipped vehicle... you may or may not see one of the following Codes stored in your vehicles memory: P0106, P0107, or P108.

Symptoms of a BAD MAP Sensor

These are some of the symptoms your 2.4L Quad 4 GM car will experience with a BAD MAP Sensor:

  1. The Check Engine Light will be on with a MAP Diagnostic Trouble Code (DTC) stored in the Computer’s memory.
  2. If your 2.4L Quad 4 GM car is OBD II equipped, you’ll see DTC P0106 or P0107 or P0108.
  3. Your vehicle won’t start or will have a long cranking time before it starts.
  4. Black smoke coming out of the tailpipe along with really BAD gas mileage.
  5. The engine idles rough when running and has a lack of power when accelerated.

MAP Sensor Code Won’t Go Away
So you’ve tested the MAP Sensor and according to the test results, it’s good... But the CHECK ENGINE LIGHT keeps coming back on even after you erased the Diagnostic Trouble Code (DTC) from the Computer’s (PCM) memory. Well, here are a couple of suggestions that might inspire your next diagnostic move:
1
The MAP Sensor’s O-rings, the ones located on the Vacuum inlet nipple are missing or are too old and they’re not sealing properly. Visually check the O-rings and replace if necessary.
2
The Engine has several Cylinders with very low Engine Compression causing it to Idle Rough and thus producing low or erratic vacuum. For this I suggest a Compression Test.
3
The MAP Sensor is failing intermittently. Which means that it works fine most of the time, but every now and then... it doesn’t:
I have found that the best way to test these intermittents is to slightly tap the MAP Sensor with the handle of a Screw-driver and see if this tapping screws up the Voltage readings as I apply vacuum.
4
The MAP Sensor’s connector is BAD, usually the locking tab is broken and the connector has worked itself loose, causing an intermittent false connection.
5
Your Fuel Pump is starting to go BAD and is not sending enough fuel and/or fuel pressure up to the Fuel Injectors. I suggest a Fuel Pump Test.

The cool thing is that the Manifold Absolute Pressure (MAP) Sensor, on your vehicle, can easily be tested using only a Multimeter. Not only that, it can be accurately tested so that you can say, "Yes, it's BAD" or "NO", it's not BAD".

MAP SENSOR TEST 1: Verifying the MAP Sensor Signal with a Multimeter.
MAP SENSOR TEST 2: Verifying the 5 Volt Reference Supply.
MAP SENSOR TEST 3: Verifying the MAP Sensor is Getting Ground.
Symptoms of a BAD MAP Sensor.
MAP Sensor Code Won’t Go Away.

MAP SENSOR TEST 1:
Verifying the MAP Sensor Signal with a Multimeter

This first test will get the whole show on the road by first checking that the MAP Sensor is producing a MAP Signal or not. Depending on your results... you'll continue on to the next test or stop.
The instructions call for a Vacuum Pump. If you live here in the States and you don't have one... you can run down to your local AutoZone or O'reilly Auto Parts and rent one for free. If this option is not available to you and you're itching to get started, you can use the good ole' lungs (this will work... but I don't recommend it).
OK, this is what you need to do:
Remove the MAP Sensor from the Intake Manifold.
Connect your Vacuum Pump to the MAP Sensor’s vacuum nipple. If you disconnected the MAP Sensor, from its electrical connector to remove it from the Intake Manifold... reconnect it to it now.
Select Volts DC on your trusty Multimeter and probe the wire labeled with number 2 (in the image viewer).
The BLACK Multimeter Test Lead needs to be Grounded, preferrably on the Battery Negative Terminal.
When all is ready, turn the Key on but don’t start the Engine. This supplies the MAP with Power and Ground and your Multimeter should register 4.7 Volts DC.

Now, apply Vacuum to the MAP Sensor with the Vacuum Pump (or your mouth). You should see following DC Voltages at the following Vacuum values if you're using a Vacuum Pump:

1.) 0 in. Hg ...... 4.7 Volts.

2.) 5 in. Hg ...... 3.9 Volts.

3.) 10 in. Hg .... 3.0 Volts.

4.) 20 in. Hg .... 1.1 Volts.

Whether you're using a Vacuum Pump or the good ole' lungs, the important thing is that the Voltage should increase and decrease without any gaps or skips on the Multimeter. Repeat test steps 1 thru’ 5 several times.
OK, let’s take a look at what your Vacuum Pump Test results mean:
CASE 1: The Voltage increased and decreased smoothly and without gaps: This means that the Manifold Absolute Pressure (MAP) Sensor is good and not the cause of the MAP Sensor Code or problem on your GM 2.4L Quad 4. No further testing is required.
Now, if your vehicle still has the MAP Sensor code lighting up the Check Engine on your Instrument Cluster.. take a look at the section: MAP Code Won’t Go Away for more info.
CASE 2: Your Multimeter registered some Voltage, but not as indicated: This tells you that you have a BAD Manifold Absolute Pressure (MAP) Sensor on your GM 2.4L Quad 4. Replacing the MAP Sensor will solve the MAP Code issue (P0106, P0107, P0108)
CASE 3: Your Multimeter registered 0 Volts: This usually means that the MAP Sensor is fried. But further testing is needed to be absolutely sure, I suggest confirming that the MAP Sensor has power and ground. If both (power and ground) are present, the MAP is BAD. To test for power, go to MAP TEST 2.

MAP SENSOR TEST 2:
Verifying the 5 Volt Reference Supply


Previous imageEnlargeNext image
Image 1 of 2
So far, in MAP TEST 1, you have verified that the MAP Sensor on your 2.4L Quad 4 GM car is not creating a Signal or the Signal is erratic
And so, in this MAP Sensor Test step, you’re gonna’ verify that the MAP Sensor is getting power, since without power it won’t work. This power come in the form of 5 Volts and the PCM (Powertrain Control Module = Fuel Injection Computer) is the one that provides this juice.
Since this circuit is directly connected to the PCM, be careful and don’t short this wire to Battery Power (12 Volts), or you run the risk of frying the PCM.
Alright, this is what you’ll need to do:
1
With your Multimeter still in Volts DC mode from the previous test and the Key On (but engine Off).
2
Probe the wire labeled with the number 1, in the image viewer, with the RED Multimeter Lead.

You can test for these 5 Volts with the MAP Sensor’s electrical connector connected to the MAP Sensor or not... just avoid probing the front of the connector.
3
Now ground the Multimeter’s BLACK Test Lead on the Battery’s Negative Post.
4
Your Multimeter should show you either:

1.) 5 Volts DC

2.) 0 Volts.
OK, now that the testing part is done... let’s take a look at what your results mean:
CASE 1: The Multimeter registered 5 Volts: This is the correct result and it’s starting to look like the MAP Sensor is BAD but you still need to check that the MAP Sensor is getting ground. For the ground test, go to MAP SENSOR TEST 3.
CASE 2: The Multimeter DID NOT register 5 Volts: This results lets you know that the MAP Sensor is not BAD, since without these 5 Volts DC, the MAP Sensor can not function.
Although it’s beyond the scope of this article to troubleshoot the cause of these missing 5 Volts, you have now eliminated the MAP Sensor as BAD. Resolving the issue that is keeping these 5 Volts from being supplied will solve the MAP Sensor issue on your 2.4L Quad 4 GM car.
MAP SENSOR TEST 3:
Verifying the MAP Sensor is Getting Ground


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The next step (after verifying the MAP Signal and power circuit) is to make sure that the MAP Sensor on your 2.4L Quad 4 GM car has a good path to Ground. So, in this test step, you’re gonna’ verify that the MAP Sensor is getting ground using your Multimeter once again.
A word of caution: since this circuit is directly connected to the PCM, be very careful and don’t short this wire to Battery Power (12 Volts), or you WILL FRY the PCM.
Alright, this is what you’ll need to do:
1
With your Multimeter still in Volts DC mode from the previous test and the Key On (but engine Off).
2
Probe the wire labeled with the number 3 in the image viewer, with the BLACK Multimeter Lead.

It doesn’t matter if you probe this circuit (wire) with the connector connected to the MAP Sensor or not, but do not probe the front of the connector (if you decide to unplug the connector to test for this path to Ground).
3
Now connect the Multimeter’s RED Test Lead on the Battery’s Positive (+) Post.
4
Your Multimeter should show you either:

1.) 12 Volts DC

2.) 0 Volts.
OK, let’s take a look at what your results mean:
CASE 1: The Multimeter registered 12 Volts: This is the normal result and it means that the MAP Sensor your 2.4L GM car is fried and needs to be replaced.
Here’s why: In MAP TEST 1 and 2, you verified that the MAP Sensor is not producing the correct values (when you applied vacuum) and that it does have power. Since in this test step you have confirmed that the MAP Sensor does have a solid path to Ground... these results, interpreted together, indicate that the MAP Sensor is BAD.
CASE 2: The Multimeter DID NOT register 12 Volts: double check your Multimeter connections and repeat the test... if your Multimeter results still do not indicate 12 Volts, then the MAP is not fried and not the cause of the MAP Diagnostic Trouble Code (DTC) issue.
Here’s why: Without a good path to Ground, that the PCM provides internally, the MAP Sensor will not work. With this test result, you have eliminated the MAP Sensor as BAD.


Wednesday, June 18, 2014

1998 Chevy Cavalier Z24 2.4L LD9 Misfire Condition

Chevy Cavalier Z24 2.4L LD9 Misfire Condition. My 1998 Chevy Cavalier Z24 2.4L LD9 With 285,000K Has An Intermittent Misfire Condition After Using Fuel Injector Cleaner. My 1998 Chevy Cavalier Z24 Also Now Has:

  1. Intermittent Hard Starts.
  2. Intermittent Stalls.
  3. Intermittent Loss Of Power On Acceleration.
  4. Intermittent Mildly Back Fires On Down Shifting At Any Speed.
  5. Intermittent Mildly Back Fires After Removing Foot From Gas At Any Speeds Randomly After Using Fuel Injector Cleaner. 


My 1998 Chevy Cavalier Check Engine Light Turned On After Adding A Bottle Of Fuel Injector Cleaner ( I Read The Fuel Injector Cleaner Instructions ) And 70L Of Regular Gas To A Near Empty Tank In The City On A Rainy Day. I Usually Keep The Gas Tank At Least Half Full After Replacing The Fuel Pump About 10,000K Ago.

Prior

Uneventful 75K Later Down The Highway The Check Engine Light Came On And A Few Minutes Later The And , Now Has An Intermittent Misfire Condition And Now Has Hard Starts After Adding Blew The CEL Check Engtine Light After 75k On The Highway After I Added Fuel Injector Cleaner To A Full Tank And Filled Up. I Used A Scanner And Pulled The Following Codes.

1/9 - P0131 - 02 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 1
2/9 - P0134 - 02 SENSOR CIRCUIT NO ACTIVITY DETECTED BANK 1 SENSOR 1
3/9 - P1133 - MANUFACTURER CONTROL
4/9 - P0171 - SYSTEM TOO LEAN BANK 1
5/9 - P0502 - VEHICAL SPEED SENSOR CIRCUIT LOW
6/9 - P0131 - 02 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 1
7/9 - P0172 - SYSTEM TOO RICH BANK 1

1998 Chevy Cavalier Z24 2.4L LD9 Misfire Condition. Sometimes, even tho’ the engine is suffering a bona-fide misfire, no misfire codes are registered and no check engine light (CEL) comes on.

What Tools do I Need to Test the Misfire Code(s)?

Finding the exact cause of the misfire codes or misfire condition is possible... with the proper tools. Without them, you won’t be able to diagnose /troubleshoot those issues on your Quad-4 equipped GM car.

Depending on what the root cause of the misfire is, you may need several tools. Most of these you can buy online, none of these will break the bank and I’ll make some recommendations on them. Here’s a guide to some of the basic tools that can be and are used:

Ignition System Tests:

  1. Spark Tester.
  2. Multimeter.
  3. Test Light.

Fuel System Tests:

  1. Noid Light.
  2. Fuel Pressure Gauge.
  3. Multimeter.

Engine Mechanical Tests:

  1. Compression tester.

Now of course, you’ll also need basic hand tools like: screw-drivers, ratchet wrenches, sockets, etc. You’ll also need a generic scan tool to retrieve the Diagnostic Trouble Codes (DTC’s) from the Computer’s memory.

Keep in mind that using the right tool for the job will save you time, frustration, and /or keep you from damaging the component that you’re testing.

One of the most common problems that you or I are likely going to face with a Quad-4 equipped vehicle is a misfire condition. Although it stinks that your Quad-4 GM car is experiencing a misfire condition... the cool thing is that there’s a method to the madness of troubleshooting it.

In this tutorial, I’m going to explain in some detail the most common causes of misfires and misfire codes (P0300, P0301, P0302, P0303, P0304). And more importantly, I’m also gonna’ offer you a simple diagnostic strategy that I’m certain will help you nail down the cause of the misfire condition, misfire code, or rough idle condition your 1998 Chevy Cavalier Z24 2.4L Quad-4 GM car engine is experiencing.

What is a Misfire Condition?
What Causes a Misfire Condition?
How Can I Test the Misfire?
What Tools do I Need to Test the Misfire Code(s)?

What is a Misfire Condition?

As you’re already aware 2.4L Quad-4 engine has four cylinders. In a nutshell, each one of those four cylinders needs three things to produce power and they are: fuel, spark, and air (typically compression).
When your Quad-4 equipped GM vehicle is suffering a misfire... it’s because one of those three things is missing from one of the four cylinders. Simplified: A cylinder is misfiring because it’s missing fuel, or spark, or air (compression).

Since the 2.4L engines have only 4 cylinders, having just one of those cylinders misfire will have pretty obvious consequences due to the fact that the engine in your GM car is running on only 3 cylinders. If the engine in your car has one or two misfiring cylinders, you’ll have one or more of the following symptoms:

  1. The check engine light (CEL) will be on.
  2. One or more misfire codes (P0300-P0304) will be stored in your car’s PCM memory.
  3. P0300 Random Cylinder Misfire.
  4. P0301 Cylinder #1 Misfire.
  5. P0302 Cylinder #2 Misfire.
  6. P0303 Cylinder #3 Misfire.
  7. P0304 Cylinder #4 Misfire.
  8. Lack of power upon acceleration.
  9. Smell of unburned gas exiting the tail pipe.
  10. Rough idle and may stall.
  11. Cranks but does not start.
  12. Will not pass the emissions tests.
  13. Bad gas mileage.

Although the misfire codes don’t tell you what exactly is the cause of the misfire or rough idle condition... there is a way to find out exactly what is causing it.
One of the most important things you need to know, to successfully diagnose a misfire or rough idle condition, is what causes a misfire. Let’s go to the next subheading and find out.

What Causes a Misfire Condition?

As I mentioned in the previous heading, each of the 4 cylinders of your Quad-4 engine needs 3 things to be able to produce power. In a nutshell, these 3 things are:

  1. Air
  2. Fuel
  3. Spark

It’s when one of these three things is missing from the mix that the engine in your Quad-4 GM vehicle starts to misfire. Let’s look into more specifics:

Ignition System:

The Ignition System is responsible for the production and delivery of Spark. The Ignition System is usually the culprit behind most misfires.

The usual suspects (that cause a Misfire) are:

BAD ignition coil (remember, each coil firs spark to 2 cylinders).
BAD ignition coil cover.
BAD spark plugs.
Carbon tracks on the spark plug and spark plug boot.
Oil dripping (from the valve cover) onto the spark plugs and spark plug boots.

Testing all of the ignition system components is not hard and it doesn’t require expensive tools or expensive diagnostic equipment.

Fuel System:

The Fuel System is responsible for the delivery of fuel. If fuel is missing from any one specific engine cylinder, it will misfire.

Fuel system problems could include some of the following:

  1. BAD fuel injectors.
  2. Broken fuel injector connector (this is a very, very common problem).
  3. Electrical short in the fuel injector wires that are keeping the fuel injector pulse signal from reaching the fuel injector.This is usually the result of human error and after a major mechanical repair where the wiring harness was damaged.
  4. BAD fuel injection computer not pulsing the fuel injector (this is a very rare condition, but it happens).
  5. BAD fuel pump.

Engine Mechanical Condition:

The pistons and valves are the ones that draw air into the engine. Usually all cylinders wear out evenly... but every now and then, either thru’ lack of maintenance or some mechanical problem, you’ll have one or more wear out at an accelerated pace.

To make the long story short, those cylinders (with accelerated wear and tear) to produce a less than average compression value that will cause a misfire condition.

Other issues, that can not be overlooked are vacuum leaks.

Now that you have an idea of what are some of the causes of a misfire condition... you might be asking yourself, ‘Where should I start?’.In this section, I’m gonna’ offer you a simple diagnostic strategy that should help you find and resolve the root cause of the misfire or ‘dead’ cylinder on your Quad-4 equipped GM vehicle.

STEP 1: Identify the dead cylinder.

This is the most important first test that will save you a lot of time and frustration down the road by narrowing down and focusing your misfire diagnostic.

Finding the dead cylinder usually entails connecting your scan tool to your vehicle and reading the misfire diagnostic trouble codes. Then by matching the misfire code to its engine cylinder using an illustration of the engine cylinders.

Now, the PCM doesn’t always set a specific cylinder misfire code. This is when knowing how to do and interpret a manual cylinder balance test comes in handy. In a nutshell, a manual cylinder balance test involves unplugging one injector at a time (to see which one has NO effect on the engine’s idle).

The fuel injector that does not worsen the engine’s idle when unplugged... tells you that that specific cylinder is ‘dead’.

STEP 2: Test the ignition system .

Once you have identified the dead cylinder, the next step is to check that all 4 spark plugs are getting spark.... since the majority of misfires are caused by a failed component in the ignition system. You should:
Perform a spark test (using a dedicated Spark Tester) on the spark plug wire of the cylinder that the misfire code is accusing of being dead.

Testing for spark with a spark tester is the most important first test... since you’ll know right away if the misfire is due to a lack of spark.

Check to see if the spark plug boots and spark plugs are swimming in engine oil from a leaking valve cover gasket.

If you got spark from your spark tester (from the cylinder the misfire code is accusing of misfiring), the next step is to remove the spark plug or spark plugs (of the affected cylinders) and check them for wear and tear, carbon tracks, anti-freeze, etc
.
If you get no spark, then the next step is to check for spark directly on the ignition coil pack tower.

You can find all of these ignition system tests here:
How to Test the Ignition Coils GM 2.4L Quad 4 (at: easyautodiagnotics.com).
Diagnosing a BAD Ignition Coil Quad 4 Case Study (at: easyautodiagnotics.com).

STEP 3: Test the fuel injectors. If the ignition system is not the cause of the misfire, then the next step is to check the fuel injectors.

You’ll need to:
Resistance test each of the 4 fuel injectors.
Do a noid light test of each one to make sure the PCM is pulsing them (activating them).
You can find the fuel injector tests here:

How to Test the Fuel Injectors (GM 2.4L Quad 4).

STEP 4: Test the compression of each engine cylinder. Other tests that should be done, if the ignition system and fuel injectors check out OK are:

Engine compression test.

Checking for vacuum leaks.

You can find the engine compression test here:

How to Test Engine Compression (GM 2.4L Quad 4).

The above list of steps may seem/sound like troubleshooting a Misfire is a complicated thing... but it really isn’t. Depending on your level of ‘wrenching’ experience, this is something that you can accomplish without taking it to the shop.